Losing one of Bradley, Crowder and Smart would make me pretty sad, but it's inevitable.
I think Crowder is most likely to go. He's the most easily tradeable (but also has the best contract situation), but he's also the most directly duplicated by the wings they've added this summer. I'm not sure Crowder does anything better than Hayward, except perhaps some positional versatility at the 4.
How much time do they have to clear the cap space? Is it the 8th?
Man, if Hayward would just take $300K less this year, it'd all be gravy. But I suppose that's a bit greedy. That cap figure coming in lower is going to likely cost the Celtics a pretty good player.