Buccaneers.com Scott Smith on what the team's backfield looks like at this point in the offseason:
"I've made a point of noting that Buccaneers RB Charles Sims was a very productive runner at both West Virginia and Houston, since he seems to have been pigeon-holed since the draft as a pass-catcher only. Still, we can't ignore that it is his pass-catching ability that HC Lovie Smith cited immediately after the Bucs drafted him, and that Smith has referenced that potential role for Sims on several occasions since. Right now, Sims seems like the most likely of the three (Bobby Rainey, Mike James) behind Doug Martin to be involved in the offense on Sundays, but I still believe it will be in a complimentary role to Martin.
"The Bucs could very well keep all four of those backs on the roster, but even if they did they would likely only have three of them active on any given game day. So in this scenario you have Martin starting, Sims taking a handful of carries in his place and perhaps also serving as the third-down back and either James or Rainey taking some series from Martin as well."
We've moved Sims up the depth chart. He'll likely be the second-most valuable RB on draft day, though he may not see the carries that a typical RB2 might see given the quality runners behind him (James, Rainey). As for Martin, he comes in at #12 in the standard RB rankings. It doesn't sound like he's going to dominate the touches like he has in his first two years in the league.