Firstly, the Rule 5 draft is over, so that isn't a concern.
Secondly, the Mets currently have only 38 men on their 40 man roster. So there's your 2 extra spots.
"No on wants Crisp or Hairston. GTFOH with those two. We want Bourn, Fowler, Brantley...guys like that. "
Bourn would be okay. Fowler would be fine if we played half our games in Colorado (check his splits).
As for Brantley, what's the appeal? He has little pop, not much speed, and other than last year a terrible career OBP. If he's a GG-calibe fielder (I have no idea if he is), then he'd be a decent piece to add.
Bourn has no pop too, but he is speedy which would help in CF in the Cavern. Decent OBP too.