the evaluation argument shouldnt fly, they should have known and considered the risk associated with the injury before executing the trade.
One team is adamant he doesn't need surgery, the team that traded for him isn't able to find out the extent of his injuries until they have their own team doctor look at him. That is the reason the voiding process exists.
The process of voiding a trade exists for a reason, you're trying to play it off as though the Cavs simply wanting more out of the blue and not because they got a look at Thomas up close.

