I wouldn't listen to people who are hung up about draft positions when valueing players... just look at Dwayne Bowe vs Miles Austin last year (Dwayne Bowe waiver wire, Miles Austin second round).
That said, I wouldnt veto a Sproles for Fitz trade, but i also would want to be on the side giving up Sproles. We know the upside with Fitz, and Sproles will always be limited by carries. If he still likes it with the question mark for AJ, go for it. If not, you could try something like Lloyd, Ginn and Sproles for Fitz and LT.
Honestly Ginn is worthless, not sure why anyone would own him. but maybe hed go for it.