I'm not sure I see the point of the trade either, although I do like Smith more than Jennings. Everyone keeps waiting for Jennings to bust out but Smith has been pretty consistent this year. Unless it's a 2 QB league, I can't see starting either Manning or Freeman.
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