Doesn't he want to play in the NY metro area? If so, I doubt the Devils or Islanders will want to pay much bc they're looking at rebuilds and may as well try to get him in free agency (unless they can buy low). The Rangers may be interested but if the Blues ask too much, they will probably wait until free agency too. (They probably will want to pay with picks, though, which Blues fans seem to want, since they want to contend.) I think if he goes, the Blues will get back a rental price, maybe a bit more, but not a lot more.
That is a rumor created by NY fans. The only thing Shattenkirk has said is that he wouldn't resign in Edmonton