His playings days were before my time but my understanding is that he totally changed his running style at one point in his career. I thought he had an elusive Faulk like game and then had a knee injury. He then came back as a power back with an Earl Campbell like game and was equally as effective. I don't know what ACL surgery was like then or if that was even the issue. But he went from running past defenders to deciding if the speed was gone he would run through them. Sounds like the heart of a champion to me.