Yes. Since you can only keep a limited number of players, you should trade all players you can't keep, to upgrade the players you will keep. McFadden has some injury risk, but so does Bradshaw (if to a lesser degree). McFadden has higher upside when he's playing though. Any chance you can trade Lloyd? Since it sounds like you won't be keeping him, he might get some interest from other teams, now that he's with Brady. Maybe you can upgrade one of your other keepers (Steven Jackson and Kenny Britt look upgradeable). SJax is an injury waiting to happen, and Britt will still be slightly limited for at least the first part of this upcoming season. Britt has better long term upside though.
10 team ppr keeper/cap league
QB: Stafford, Cutler
RB: Foster, Rice, Sproles, Jacquizz, Tate, Wilson
WR: Green, Austin, Decker, Colston, Ogletree
Def: Green Bay