From what I know shanny has always relied on ONE back. Right now everyone is screwed because Q-Tip couldn't do it and Bell hasn't either 1. got out of the dog house or 2. he just isn't as good as advertised. Point being is that the whole situation is a mess. I don't think RD is the answer, he did have a great game, against one of the worst run defenses in the league, what does that prove about RD, nothing more than any back can run in this system. I do think RD will get another chance to prove himself and if he does he might earn the confidence of shanny, but if he doens't you can just count on him to be part of the mess in Denver. One positive about RD is that he is a good run blocker so I can use him in different situations, whereas Q-tip wasn't a great run blocker so he would get pulled out on passing downs.
Personally I'm going to pick him up and roll the dice, if he pans out I just got a top 10 back, if he falls flat on his face, I'll just trade him out for the next one week wonder, I heard Chatman had a good game.