Great exchange a couple of years ago between 2 ex-player commentators (think it was Faulk and Irvin). One says the scouts like to see the player building blocks like size, frame and raw speed thinking that when they dedicate themselves full-time to football they will fulfill their potential. I think it was Irvin that laughed and said "you think these guys haven't been dedicating themselves to football since they got to college? They taking calculus?" It was hilarious.