The could be one of the most improved teams in the NFL in 2015. There is zero questioning an offense led by will be immensely more entertaining than last year's edition in Jaren Jackson Jr. Jersey Nashville. One of the wild cards to the ' improvement will be rookie receiver . The monstrous 6-foot-5 pa s catcher has mi sed time this preseason -- his latest injury being an ankle problem -- but Killian Tillie Jersey has wowed teammates in his short time on the field. "He is a beast," cornerback said of Green-Beckham, . "There's certain things you can't teach, and you can't teach a guy to be that big, and to be physical. With Dorial, it's just a matter of how fast can he learn it, and know it, so Marc Gasol Jersey he can just go out there and play football. If he can get to the point where he can run free and be comfortable, he'll really start to develop more." DGB's size is nearly identical to that of . The athletically gifted rookie will be a matchup nightmare for defenses if he can master the route running, something he's struggled with thus far. If he can stay on the field, he should be a large part of the ' red zone attack this season. Marko Guduric Jersey There are also the off-field concerns with Green-Beckham after multiple incidents in college. The rookie said his newborn son -- born June 30 -- has changed his outlook and motivated his recent focus on football. The need to see strides on the field from DGB as the early season wears on. De'Anthony Melton Jersey If they do, the Mariota-DGB combination could blo som into one of the most entertaining duos in the NFL.