I guess if he is going to sign with the Cavs, let him. But I would sign him just to keep him off any team in the West. Besides, I think he'd be a good player to have around. Provides the kind of size and strength that just doesn't exist on this team, passes really well, is a mother****er, and savvy as hell.
If they want him, just don't let him clear waivers.
If they buy him out we can't sign him (well we could but he has to agree to it). If they simply just waive him then we can claim him (if no one above us on the waiver list does so).