RB2 Needed!

Hey Foot Clan! Sitting at 7-2, defending champ, but need an RB2. Full PPR.

QB: Alex Smith, J. Goff (for week 10 stream)
RB: Lev Bell, Riddick, BlowPowell, Alex Collins
WR: Julio, Michael Thomas, Sterling Shepard
TE: Kyle Rudolph, Greg Olsen

Available on FA: Gore, Stewart, Mack, Rob Kelley, Blount, Rawls, Charles, and some other barfies.

Please let me know what you think of this situation. Thanks all!