Even with modern training methods increasing his speed and size Jim Brown would not have the same advantage he had 50 years ago. He was bigger than almost everyone on the defense trying to tackle him. Even if you put 25 pounds on him (make him 260), he is going to be smaller than all the defensive line and the same size as the linebackers. He didn't have much lateral movement. He averaged 5.2 ypc with straight ahead power and speed, that would get him around 4 yards a carry these days.
[ Edited by BobS on Aug 23, 2012 at 10:39 PM ]