If KJ would come in agreeing to be the fourth WR and settle for low cash in exchange for a chance to win a SB, I'd sign him in a second and tell Moss to mind his own business. The Patriots are an NFL team, not a therapy session for whacky Randy. If he's sincere (does Moss knows what that word means?) about being in NE to win a SB then Randy ought to welcome KJ with open arms.
Cutting Gaffney or Caldwell to make room for KJ would cost the Pats crumbs on the 2007 cap, so why not? If one figures that cap space will be spent on a WR either way then would you rather pay KJ, Gaffney or Caldwell?
Keyshawn would be my choice. Besides, BB would be seen as some kind of faith healer if he could get KJ and Moss to coexist sucessfully.