Agreed that Redman is the better back behind this line and has run better this year, but RB depth is going to be an issue. The Steelers can't enter the playoffs with only Redman and Clay in the backfield...they'll need to pickup another back.
As for this game, I don't know what to think right now. The Steelers aren't playing well IMO, but they should be able to get past this Bronco's team. Of course, they've played poorly against the likes of KC and Indy so anything can happen.