Grant for sure, he's at least a featured back guaranteed to get his touches. I'd go with Boldin too just because of his skill level. Last spot I'd probably roll with Hightower, even with the emergence of Beanie Wells. MM has faded with Smith/Nicks getting a lot of Eli's attention, and I know Lee Evans has turned in two solid games now, but the QB situation and the oline in Buffalo is still so awful I wouldn't trust using him over your other options. If Boldin isn't good to go, though, I would use Evans over MM.
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