If you wouldn't be starting any of them, I would say keep Wallace. When Ben returns, he could be great. The others could too, but I think Wallace will be in a better situation.
12 Team League. We start 2 QBs and get .5 PPR, otherwise standard scoring
QBs: Stafford, Fitzpatrick, Collins
RBs: Charles, Mendenhall, Best, Starks, Carter, Karim
WRs: D. Jackson, Marshall, S. Smith, Green,
TE: Hernandez, Cook