Well, here's the sit:
Behind RW is a Travis Minor, who's sort of a scatback kinda guy and been with the Phins for, I dunno, is this is 4th year? He's been generally productive when he's been put in as a 3rd down guy but he doesn't get put in much with Ricky around. He's somewhat of a fan favorite though I've never been impressed with him very much.
Behind Travis is Leonard Henry who is a bit of a bruiser with decent speed, appears to be instincitve and with good field vision. Personally, if Ricky were to go down, Henry looks closer to the pounder that RW is than Minor and I'd like to see him get a shot at 2nd team.
The bottom line is we've got decent depth at RB. I don't know, they kept Charlie Rogers last year as a 4th RB / KR, but that was based on his KR responsibilities (which he failed at, miserably).
I've read some good things about Russell though, I'm pulling for him to make it.