Problem is, Riley had a very different definition of a running back's performance. One interview that always stood out to me was a few years ago when Bryant first arrived, Riley was just gushing about him. But there wasn't a single word about how well he ran, all Riley could talk about was how good Bryant was at pass protection. Riley paid lip service to the ground game, but I think we all know he was really all about passing, and the rest was just window dressing. And to him, an RB's ability to take a hand-off and run was maybe his third most important trait behind pass protection and catching passes out of the backfield.
Consequently, I expect this year's RB depth chart to be dramatically different than last year's. In particular, I think we'll see more from Wilbon, and possibly Bradley as well.