If Toronto cuts Marion, they lose the opportunity to do a sign-and-trade. Now, there may not be very many S&T deals this season (who wants to take back ANY salary?), but unless Marion were willing to walk away from a big chunk of his salary I don't see why Toronto would do that.
'Sheed would be awesome, but Detroit can't do that; that's throwing the towel in on the season. They've got too many wins to start tanking for draft position, all they'll do is tell people not to come to the games. If they DID, Pruitt'll be cut in a heartbeat if 'Sheed wants to sign here.
Gooden wouldn't be too much of a surprise. I don't particularly care for him as a player, but he's above Joe Smith (and miles above Mikki Moore).