those guys also got stronger as their careers went on... there's no ****ing way he gets stronger than that even IF he stays healthy. he'd have broken down pretty rapidly anyway, they rode the **** out of that horse (get it? horse? bronco? nay!)
it would be more accurate to compare those players' best four year stretches against terrell davis, honestly. also, that blocking scheme made guys far more than they really were--olandis gary and mike anderson say 'hey.'