I'm not convinced that there is one this year. Oh sure, someone could become a viable spot starter if you're lucky enough to pick the right week, but in today's NFL with RBBC galore, even most of those guys - even if they do step up, will split carries/goal line/receptions with other RBs on their respective rosters. 2 of the 3 guys you have listed are on pretty bad teams (RBs on bad teams don't tend to put up great FF numbers - good sure, but not great. Their teams are playing from behind too much). Starks...meh. He seems decent enough, so maybe.
But aren't we still waiting on the next Michael Jordan? Next Chris Johnson (heck, the original Chris Johnson isn't even looking that good lately)? The next Randy Moss or TO? Guys like Ryan Matthews or Jahvid Best or Michael Crabtree or Dez Bryant were supposed to be those guys.
Sorry, I don't see too many diamonds in this year's rough. A small ruby or emerald maybe - but no big, fat, "win me a championship" diamonds.