they don't have to accept anything. Keep Kyrie if y'all want or make that Bucks deal and get swept by the Warriors. It's their choice. If IT's value decreases to other teams, Ainge still has Crowder and the Brooklyn pick back in the fold.
Please tell me all the PGs better than Kyrie on the market right now or potentially in the future, consider that they already said his age played a big role in trading for him. If Thomas is hurt and the trade is voided you'll have to start Rozier or Smart at PG, which makes you worse than the Wiz, Raptors with the Bucks potentially getting Kyrie they'd be better than you as well.
Crowder and the Brooklyn pick isn't getting you a PG of Kyrie's caliber because he's the only one on the market now, or for the foreseeable future.
Take him back, finish wherever you was gonna finish at and draft his replacement in 2018. fukk adding players to a done deal. That's not leverage for the Cavs in my opinion.
The Celtics are doing a conference call, apparently they planned on renegotiating, therefore the Cavs do have leverage especially with another trade partner out there, one that would be better than the Celtics if Kyrie is traded there.