It seems like Austin is the most likely to draw the attention of Revis. KC's gameplan is sure to be run heavy, and Dexter is sure to get some of that. I'd like Knox if I knew he was gonna get the snaps, but I don't, so I'd tend to lean towards your decision and go with McCluster. Is your league PPR?
12 Team PPR
1 QB, 2 RB, 2 WR, 1 TE, 1 Flex (RB/WR/TE)
QB: Newton, Ponder
RB: Rice, Sproles, R. Bush, F. Jackson
WR: S. Smith (Car), Decker, Hixon
TE: Gates, Pettigrew