No, I don't think you are very far off. I think Plummer can be very useful in bigger leagues. I for one am in a 14 team league and waited to draft a qb because of an insane early run on them, and wound up with a pretty good team but only he and garcia as my 2 QBs. I thought I would use Garcia more, but if you look at the schedules of both, Plummers is far more fantasy friendly. i am expecting 3100 yds, 22 tds, and about 300 rush yds, 3 rush tds. i think with that he will be fine. granted he could nose dive as well with the question marks on the DEN off.
RB:M. Faulk, Dillon, Warrick Dunn, Steven Jackson, Tatum Bell
WR: Moulds, Andre Johnson, Jimmy Smith, Lelie
K: Josh Brown
14 Team League Starts: QB,2 Rbs, 2 Wrs, 1 Flex,1 TE,1 K, DEF