RB's are a dime a dozen, you don't have to be special to be effective in this league, just need to be young and have fresh legs especially late on the season when teams are banged up. I'll take numbers and youth over one superstar RB who's worn down with excessive carries. I think we will be just fine with Grrene, Mac and Powell.
I think our offense will be fine with the RBs we have on the roster. None of them are stellar, but Greene is a workhorse, and with a new RT situation (one that breaks even instead of being a massive glaring weakness) and being the first team with a "legitimate" (I use this word lightly) QB/RB running the wildcat, I think we will be fine on O, and Sanchez will be poised for a career season....god help us if it isn't