I wouldn't make this trade. I just don't think Grant is enough of an upgrade over Stewart to make this work for you. I think AJ/stewart score more points than Miles/Grant this year.
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