You took the words out of my mouth with your self-analysis.
I agree with the David Wilson pick and would certainly have made the same decision were I in your shoes. I would've liked to see a RB in rounds 8 or 9 where you grabbed Givens and Gordon, but in a PPR league WRs are certainly flex-able. Your best bet, like you said, is to wait until during the season to trade for some RB depth. If someone of the Gordon, Givens, Jeffrey, Floyd group catches fire you could package one, or move Torrey Smith and slot the hot starter into your lineup.
Overall, great top end PPR RB talent, some interesting WR depth, a solid pocket passer with weapons, and a good TE combo.