He came after walter so no matter how good he was... it would have never been good enough.. and...
injuries... this guy probably would have been a HOF player too if he hadn't got nipped by the injury bug.
Yes, like many good running backs he didn't last. Happens a lot to running backs, even great ones, because they can take a beating and then injury blights their career. Seem to remember a great Bronco RB (hate the Broncos but anyway) who was truly a beast had his career cut short by at least a few seasons. Tyrell Davis or something?