I don't think they'll move Thomas for depth fiddling. This team needs shooting and he provides that.
I also don't think McCaw has any value, and Nick Nurse seems oddly enamored with him so....?
It doesn't solve issues at the 5, but since you just mentioned him in the post above this one the T'Wolves waived Hollis-Jefferson today. He wasn't exactly a huge move-the-needle guy for the Raptors last season and he's kinda crap offensively, but if they want an athletic, switchable big wing defender you could do worse than have him at the end of the bench.