Wins and lo ses don't count in the NFL preseason -- but individual performances sure do. After each week's slate of preseason action, Bucky Brooks will shine the spotlight on one notable player from each team in the league, grading that player's performance and providing a snapshot of how he's doing in this critical dre s-rehearsal phase of the 2015 campaign. The performance grading scale is as follows:A: Masterful B: Strong C: Acceptable D: Marginal F: UnacceptableEASTBuffalo Bills: Tyrod Taylor, QBGRADE: B+Strengths: Taylor continues to impre s evaluators with his athleticism and improvisational skills. He is an electric dual-threat playmaker with an uncanny knack for escaping pre sure in the pocket, as evidenced by on Thursday. Most importantly, Taylor is a fairly accurate pa ser capable of delivering dimes from the pocket or on the move. After completing seven of his 10 pa ses for 65 yards against the ' starters, he is starting to show scouts he is more than just a "run-around" quarterback.Weakne ses: Taylor's inexperience as a starter is reflected in some of his game-management gaffes. He took a costly sack on third down at the end of the ' first drive, forcing a long field-goal attempt ( mi sed from 46 yards). With the intent on playing a conservative style (ground game and defense), Taylor can't mismanage scoring chances.What he needs to work on: Taylor must continue to show Rex Ryan that he has the management and leadership skills to be a starter. He certainly dazzles with his playmaking skills, but how well he manages critical situations ultimately will determine if the can win under his direction.Miami Dolphins: Damien Williams, RBGRADE: B+Strengths: Williams is a versatile back with a sneaky combination of quickne s, balance and body control. He is fast enough to work the edges, but also excels on inside runs, as evidenced by on Saturday. Additionally, he catches the ball out of the backfield (see: ), which makes him a threat on pa sing downs.Weakne ses: This second-year man, who went undrafted in 2014, has worked his way up the depth chart by displaying explosivene s and versatility. However, he needs to be consistent and continue to manage his ball security. Although his effort Saturday on a near-mi s touchdown is commendable, fumbling in the scoring zone would obviously be costly in a regular-season game.What he needs to work on: Williams needs to finish the preseason strong after opening eyes with his superb performance at Carolina. He will get extended action in the coming weeks and needs to post solid production to convince the ' staff that he can handle the backup duties behind . If he can continue to dazzle as a runner/receiver, Williams could earn the job and become a contributor to Miami's up-tempo offense.New England Patriots: Chris Harper, WRGRADE: A-Strengths: It's uncommon for an undrafted rookie to come in and immediately crack the rotation, but that could be the case for Harper, based on his impre sive route-running skills and strong hands. He not only shows excellent patience and savvy at the top of his routes, but Harper has a keen understanding of timing -- the young man just knows when he needs to get open within the route progre sion. Additionally, Harper shows impre sive running skills and could make contributions as an emergency punt/kick returner.Weakne ses: Harper has been the ' best receiver during the preseason, but he lacks the speed to be a home-run hitter on the outside. Although he is a nice fit in the ' quick-rhythm offense, the fact that he doesn't stretch the field as a vertical playmaker prevents him from separating from a competitive Homer Bailey Jersey group of receivers fighting for a final roster spot.What he needs to work on: Harper has shown up in each of the ' first two preseason games, but he needs to make an impre sion in Week 3 to solidify a spot in the rotation. The third preseason game is considered a dre s rehearsal; Harper can open the eyes of the coaching staff by making plays against the opponent's first-string defense in a regular-season-like contest.New York Jets: Leonard Williams, DTGRADE: B+Strengths: Williams is as good as advertised, truly a disruptive force at the point of attack. The rookie rusher flashes explosive first-step quickne s and excellent snap-count anticipation in one-on-one matchups in the trenches, which . With Williams also displaying a strong nose for the ball (four tackles and 1.5 sacks), the ' have another talented weapon up front.Weakne ses: Despite Williams' remarkable athleticism and movement skills, he needs to refine his hand skills. He doesn't fully utilize his quick hands and length to keep defenders at bay, which allows blockers to grab and clutch the young defender in tight quarters.What he needs to work on: Williams is making solid progre s as a playmaker in the middle, but he must work on using his hands better at the point of attack. If he learns how to attack blockers quickly with his hands, he could be an unstoppable force in the middle by the end of the season.NORTHBaltimore Ravens: Bryn Renner, QBGRADE: BStrengths: It's important to keep the performance of a third-string quarterback in perspective, but Renner's play will create buzz in the ' facility. The youngster showed outstanding poise and composure while directing the offense, completing 15 of his 21 pa ses for 158 yards and two touchdowns. Renner delivered a host of quick-rhythm throws on target to receivers running free on the perimeter, including against two-deep coverage down the boundary. With Renner also displaying the ability to get to his second read in the progre sion, the young signal caller played like a savvy veteran from the pocket.Weakne ses: Renner lacks the prototypical big arm a sociated with most franchise quarterbacks. As a touch pa ser, he relies on anticipation and timing, yet he hasn't played enough snaps to develop the full repertoire of throws needed to make up for limited range. Renner must be Lucas Duda Jersey exceptional in this area to atone for his limitations as a deep-ball thrower.What he needs to work on: After opening eyes with , Renner earned high marks for his play in the second half against the on Saturday. He showed poise, leadership skills and confidence. While it is unlikely that Renner can supplant veteran as the backup in Baltimore, he certainly shows some promise as the team's No. 3 quarterback. If Renner continues to get the ball out of his hands on time in Week 3 -- and delivers strikes at short and intermediate range -- he could convince the that he is a worthy developmental quarterback prospect.Cincinnati Bengals: AJ McCarron, QBGRADE: BStrengths: McCarron is a quick-rhythm pa ser with strong management skills and a high football IQ. He plays the game in an efficient manner and is willing to utilize each option in the route to move the chains. , McCarron patiently distributed the ball to tight ends and running backs underneath soft zone coverage, particularly during the ' lone touchdown drive. The patience and poise exhibited during that drive was surprising for a young pa ser making his first appearance in an NFL game. (McCarron mi sed the entire 2014 preseason and regular season with injury, and sat out the 2015 preseason opener with another health setback.)Weakne ses: McCarron hasn't played much football in the last couple years due to various injuries. Thus, he needs more repetitions to acclimate to the speed and quickne s of the pro game. From a playing perspective, McCarron is a touch pa ser with adequate arm strength and range. He didn't attempt to push the ball down field against the ' umbrella coverage, but some scouts cited his limited range as a po sible concern during the pre-draft proce s.What he needs to work on: McCarron needs more repetitions at the position. He hasn't played a lot of snaps since leaving Alabama and the inexperience will lead to some miscues in the pocket. Thus, McCarron needs to get extensive playing time in the coming weeks to show coaches where he stands with his development as a potential starter. He got off to a good start against Tampa Bay, but he must build upon the solid performance with a strong effort in Week 3.Cleveland Browns: Johnny Manziel, QBGRADE: B+Strengths: Manziel's athleticism and improvisational skills create problems for opposing defenses when he extends plays. He is shifty enough to evade rushers in the pocket, yet also displays the running skills to pick up first downs on impromptu scrambles. Most importantly, Manziel shows the ability to make pinpoint throws on the move, as evidenced by on a bootleg play to his left.Weakne ses: Manziel remains a work in progre s as a pocket pa ser. Although he delivered the ball on time for most of the game , he is still working on tying his feet to his eyes on the pocket. If Manziel can keep his feet and eyes in sync within the pocket, he will consistently deliver accurate balls to his receivers on the perimeter. In addition, Manziel needs to do a better job identifying blitz pre sure and hot reads at the line. The threw a lot of different looks at the second-year pro, and he wasn't always on the same page as his receivers. (While some fault could lie with the receiving corps, it is important for the quarterback to make sure his perimeter players understand which guy is the first look against pre sure.)What he needs to work on: Despite making significant growth as a pa ser this preseason, Manziel still needs to improve his management skills and situational awarene s. He must demonstrate a keen understanding of down and distance, time and score, and make sound decisions with the ball based on circumstances. Manziel has shown better management skills to this point, but he has to be consistent with his approach to earn the trust of the ' coaching staff.Pittsburgh Steelers: Bud Dupree, OLBGRADE: BStrengths: Dupree is a high-motor player with outstanding athleticism and agility. He exhibits terrific first-step quickne s and burst as an edge rusher pursuing the pa ser. , he was relentle s in his pursuit -- and the extra effort resulted in a sack.Weakne ses: Dupree is a better athlete than pa s rusher at this point. He doesn't have a feel for sequencing his moves to get free, winning on sheer effort and hustle. Dupree also needs to work on being more physical and stout against the run. He gets knocked around a bit at the line of scrimmage and fails to consistently set the edge against perimeter plays.What he needs to work on: Dupree finally showed up against the . However, the need him to be a more consistent threat. Dupree must develop an effective go-to move off the edge to become a real factor as a pa s rusher.SOUTHHouston Texans: Kevin Johnson, CBGRADE: A-Strengths: Johnson was arguably the most versatile and technically sound corner in this year's draft cla s. The Wake Forest product continues to display a dynamic set of skills as a cover corner. Johnson showed outstanding footwork, movement skills and awarene s playing on the outside , yet he was just as effective working Brian Flynn Jersey in the slot as a nickel corner with the second team. He registered a breakup on a pa s to , exhibiting exceptional anticipation and footwork on the play.Weakne ses: Johnson's ultra-competitive demeanor will lead to a few flags when he challenges receivers down the field. He received a questionable defensive holding penalty in the second quarter, but the rookie will avoid infractions in the future when he acclimates to the NFL rules restricting exce sive contact on the perimeter.What he needs to work on: Johnson is slated to serve as the ' CB3 heading into the season, but he needs to continue to hone his technique on the perimeter. Although his footwork and movement skills are nearly perfect, Johnson has to work on keeping his hands off receivers down the field.Indianapolis Colts: Jack Mewhort, OTGRADE: DStrengths: Mewhort is a mauler/brawler-type blocker adept at moving defenders off the ball. He excels at creating movement in the run game and is a solid finisher at the point of attack. He plays a bit too high, but he's a scrappy blocker capable of generating a push at the line of scrimmage.Weakne ses: Mewhort, who started 14 games at guard as a rookie last season, remains a work in progre s as an edge blocker. He struggles with speed and quickne s, as evidenced by early in . The second-year pro later surrendered a sack to that also exposed his flawed technique and awarene s. Although it takes time to transition to the edge after spending a season on the interior, Mewhort's struggles against the could lead to concerns about his ability to hold up against elite rushers in the regular season.What he needs to work on: Mewhort must improve in pa s protection for the to feel good about the fortre s around in the pocket. While the coaches are exhibiting patience during Mewhort's transition to right tackle, the fact that he struggled against speed and quickne s on the edge is a major concern for Indy heading into the regular season.Jacksonville Jaguars: Allen Robinson, WRGRADE: BStrengths: Robinson is a big-bodied pa s catcher with all of the traits to develop into a true WR1. He flashed strong hands and outstanding ball skills , finishing with three catches for 63 yards. He is a strong runner in the open field, as evidenced by in the first quarter. With Robinson performing thus far in the preseason, the should feel good about the second-year pro anchoring the aerial attack.Weakne ses: Robinson isn't a burner on the perimeter. Thus, he is limited in his ability deliver impact plays on vertical routes. While he is capable of winning on double moves or stutter routes, Robinson lacks the burst to run past defenders on straight speed routes (go-route or post).What he needs to work on: Robinson is finding his groove as the ' WR1, but needs to continue to work on his timing and rhythm with . The need their young stars to hit the ground running in Week 3 of the preseason, to build up their confidence heading into the regular season.Tenne see Titans: Marcus Mariota, QBGRADE: AStrengths: Mariota's athleticism and movement skills make him a dangerous weapon on the perimeter as a dual-threat playmaker. He is quick enough to turn the corner on bootlegs and waggle pa ses, but he also throws well on the run, as he demonstrated on in . Mariota showcased solid running skills in the zone-read. He masterfully executes ball fakes at the mesh point; his vast experience reading the defensive end (going back to Cheslor Cuthbert Jersey his Oregon days) allows him to give or pull (QB keeper) without hesitation. Mariota only registered one carry in the game, but his ability to bluff the quarterback-keeper helped pick up yardage on the inside zone-read concept.Weakne ses: For all of the progre s Mariota has made transitioning into a traditional pro-style offense, the rookie still needs to work on making full-field or pure-progre sion reads from the pocket. Mariota rarely was asked to scan the field from sideline to sideline as a collegian, but the ' offense features a few pa sing concepts that instruct the rookie to read the entire field before getting rid of the ball. Although Mariota has shown glimpses of being able to execute pure-progre sion reads (see: ), the rookie needs more reps and experience executing traditional drop-back pa ses.What he needs to work on: Mariota continues to impre s as a rookie starter. He got the ball out of his hands quickly against the , exhibiting outstanding decisivene s and awarene s in the pocket. Most importantly, he quickly diagnosed St. Louis' exotic blitzes and made the proper checks to get the into the correct play. Although Mariota earned high marks for his performance in Week 2, the rookie must continue to work on going through his progre sions in the pocket and delivering the ball on time. Given extended playing time in the next game, Mariota will get another opportunity to refine his skills as a pocket pa ser.WESTDenver Broncos: Shane Ray, OLBGRADE: BStrengths: Ray is an energetic pa s rusher with exceptional first-step quickne s and burst. He shows cat-like quickne s attacking quarterbacks off the edge, yet he also flashes the ability to win with an a sortment of power moves (bull rush and butt-and-jerk). Ray started to put it together , notching a pa s breakup and a half-sack.Weakne ses: Despite Ray's activity as a pa s rusher, he still struggles setting the edge on running plays. The rookie gets knocked off the ball a bit, and his lack of penetration could become a problem against teams intent on running to the edges. Although his competitivene s on the edge is admirable, Ray must continue to work on his run-stopping skills to be more than a situational player for the this season.What he needs to work on: Ray must become a stouter presence on the edge against running plays. While he immediately can make contributions as a situational rusher, the need him to grow into an effective run defender to earn a role as an every-down player.Kansas City Chiefs: Marcus Peters, CBGRADE: BStrengths: Peters is a versatile cover corner with dynamic skills and outstanding instincts. He is most Alex Gordon Jersey effective playing from a pre s alignment, but he is also capable of blanketing receivers from "off" coverage using a traditional backpedal or bail technique. Peters will challenge receivers on the perimeter when the ball is in the air, leading to knock-downs and breakups when he anticipates throws in his area. Overall, Peters' aggre sive approach could make him a standout defender early in his career.Weakne ses: The first-round pick must be more consistent and disciplined with his technique. Although he po se ses all of the physical tools to snuff out elite pa s catchers, Peters has to maintain his focus and concentrate on the little details (hash-split alignment, coverage a signment and technique utilization) to become a stable player on the edge. He only surrendered a single completion , but he must continue to refine his technique to consistently challenge receivers on every pa s attempt.What he needs to work on: Peters has been a solid performer during the preseason. He has been close to receivers on nearly every pa s attempt in his direction, which is a good sign for a young defender. Heading into Week 3, Peters needs to remain solid with his footwork and fundamentals to earn the trust of his teammates and coaches. He has shown flashes of greatne s throughout camp, but he has to consistently play well in games to build confidence as a playmaker.Oakland Raiders: Latavius Murray, RBGRADE: BStrengths: Murray is an electric runner with explosive speed and quickne s. He is at his best working on the edges, but he flashes enough wiggle and burst to weave through traffic on inside runs. Murray has a knack for spotting creases on the back side, leading to big plays against fast-flowing defenses. The third-year pro had a limited workload , but he continues to flash impre sive balance and body control.Weakne ses: Despite Murray's size (6-foot-3, 230 pounds), he isn't nece sarily a "grinder" between the tackles. He displays a fine se style (nimble and agile) with the ball in his hands and doesn't consistently run behind his pads or exhibit exceptional strength running through contact. Although he flashed some power , Murray needs to exhibit that kind of power and explosivene s consistently as a feature back.What he needs to work on: Murray is a dynamic player with great vision and quickne s. He has surprising "pitter-pat" for a big back, yet needs to show coaches that he can run with force between the tackles. If Murray can display strength and power in Week 3, the ' offensive staff will feel better about using him as the primary feature back going forward.San Diego Chargers: Melvin Ingram, OLBGRADE: A+Strengths: Ingram is an explosive pa s rusher with terrific first-step quickne s and closing speed. He exhibits outstanding balance and body control turning the corner, but also flashes the awarene s and versatility to vary his rushes off the edge. , Ingram on . The maneuver showcased Ingram's unique body control and quickne s while also setting up a traditional speed rush that he used later to register a second sack.Weakne ses: Ingram is a "jump-around" pa s rusher off the edge. Although his frenetic style can produce fireworks when he is on his game, power blockers with length can give him problems in one-on-one battles. Ingram must continue to develop a series of countermoves as a rusher to become a consistent force for the .What he needs to work on: Ingram is finally starting to play like the destructive playmaker the envisioned when they selected him in the first round of the 2012 . He is in phenomenal shape (Ingram lost 20 pounds this offseason), exhibiting exceptional quickne s coming off the edge. Given his limited production early in his career (six sacks in 29 games), Ingram needs to build upon the performance by continuing to display solid rush skills in Week 3.Follow Bucky Brooks on Twitter .