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Among the bigger surprises this year has been Chris Rainey, who was one of those guys that people weren't totally sure about before things got started. So far, Rainey has surprised as a runner, receiver and returner. Everything says he will not only make the opening roster, but that he'll be a big part of this season's success.
One of the things that has been so impressive about Rainey is that he's versatile, and he's been able to tackle just about anything that he's been tasked with by the coaches.
I still would put Baron Batch as the third down back, but I think Rainey will get a lot of playing time during the regular season. He's also shaping up well in the return game and should take over the duties Antonio Brown had held.