I think Wayne has to be worth more than Williams. You have enough depth at WR that it seems like someone in your league has to be hurting at WR. Williams is a bench warmer unless Brown gets hurt. Now, if he gets hurt, he's a good option. BUt I wouldn't trade wayne for someone that you'll be hoping his running mate gets hurt.
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