I think Abreu is clearly the most likely piece to be traded, as there's an immediate crunch in the OF if either Campbell or Anthony make the jump, let alone both. You could also argue for a Grissom trade but I think his value is currently down and won't get nearly as much as Abreu. If you need to hit a top 4 piece from the farm that's Mayer, as he's a little farther off and Story's still under contract for a while.Agreed.
But for purposes of the discussion, assuming Burnes and / or Fried aren't walking through the door, how are you suggesting they do that.
Or - what are the young pieces you're moving to land Crochet/similar. I'm going to assume that Campbell, Anthony and Grissom can't be it since you have them in there already. Possibly / probably not Abreu too (depends on if you're saying Campbell at 3b and Grissom at 2b or having them splitting 2b). Because if you're putting Campbell at 3b, then it'd have to be Anthony in LF and Abreu in RF. Maybe that is now Campbell in LF and Anthony in RF with Abreu possible to be moved.
As for targets: Crochet, Woo, Jones.