I think right now most Dolphins fans would account the tailbacks unit as one of the strengths of the team, thinking that the Dolphins' ground attack will be good and the only question is the passing attack.
I am just saying that I am not as sure of that as most are, because of a number of factors:
For one thing, Reggie Bush had a nice average last year but it was pretty much unprecedented rushing success for him. You get afraid, rightly or wrongly, that he's sort of a one-year wonder. I don't think you breathe the sigh of relief until the player follows that success up with more success.
For another, even taking that aside, we're talking about a multiple-cut/open-field runner moving to a one-cut zone system. I think it's OK to have some question marks about how well he's going to make that transition. Better, more established tailbacks than Reggie Bush have ended up overtaken in that system by total unknowns whose rhythm, vision and style just jives better with the zone system.
Third, you have the Daniel Thomas conundrum. Really pretty awful in 2011, one of the worst rookie tailbacks in the league. He dealt with some hamstring injuries, but I don't think those had as large effect as some (including him) would HOPE is true. He's moving to a system that benefits him more, which is good news. But is he cut out for the NFL period? I'm not sure I see the vision or the ability to consistently create yards after contact.
Finally, there's the blocking. I know we're trying to talk about the tailbacks but inevitably the success or failure of the blockers will bleed into the evaluation of the tailbacks. The Dolphins are moving to a new system and the players are still trying to get chemistry with one another in that system. Is it going to come together right away? Is that realistic?