The thing is, though... everyone knew that IT was nursing an injury... one that is fairly significant, too.
Now... if IT is injured much worse than originally reported... that's one thing. (There is no evidence that this is the case, though)
But if he is hurt to the extent that has been reported... the Cav's are being d!cks. A deal was agreed to in good faith, playing games after that is a sh!tty move.
As much as I hate to stick up for the Cavs, I disagree. This appears to be a difference of opinion between the Cavs doctors and the Celtics doctors. Best guess would be that it's a difference in how soon he'll be 100% and ready to go. The Celtics docs are probably saying by the start of the season and the Cavs docs are probably saying a month or 2 into the season. Assuming that's the case, I see no reason why the Cavs shouldn't at least try to get a little more. Just seems like smart business.
Now, if it turns out that the Cavs pressured their doctors into saying it will take longer than it should...that would be a dick move and probably something the league office would get involved in.
Also, unless the Cavs docs have determined that it's degenerative (which we'd probably already know if that were the case) and the Cavs back out entirely because the Celtics refused to sweeten the pot, that would also be a dick move.
End of the day, it's business. The Cavs are trying to get a little more, as they should and so far, the Celtics seem to be rejecting that, as they also should.