It is, he had a lot of runs for little yardage, in part because everyone knew he would get the ball 35+ times a game. Defenses would stack the line and on occasion that led to a breakout. He's a good example of a back with some spectacular runs mixed in with some/many where not much happened.
He was not great at spotting slim openings, I think, and would at times hesitate in the backfield looking for something, and he who hesitates ...
What he had was unusual power to run over safeties and the like coupled with great speed, and the willingness to carry the ball repeatedly in games.