Don't get talent, aptitude, and skills mixed up. Kids might have talent, but it takes coaching to take a top high school player and move that into a top college player. Strength and Conditioning, skill and technique work, and play calling all are required. Indeed, the coaching of matching the play calling to the boys you have at present might be in most important factor in many teams.
That was my biggest gripe when Fran was at A&M. We'd see kids go in the wrong direction, and play better as sophomores than as seniors. A tail back bulking up and getting massive, but losing the explosive cuts/turns, or guys that knew how to tackle getting congrats from the coaches for big hits rather than wrapping the runner up.