Injuries, coaching issues, etc. all play a part. Some classes are very blessed. Some are screwed over by certain things.
Hill, Williams, M Mathews, R Mathews, Kaufusi... All incredible talents who had injuries affect the number of games won and affect their careers. Doesn't mean they weren't great. Not to mention coaching staff problems during their careers. After all, wasn't it Bronco who said players win games, coaches lose games?
I don't really care what the total wins says. I know what caliber of athletes a lot of these seniors are.