Hayward's relationship with the Cs org is good. He presumably wants to go to a team where his role is larger and more straightforward, and were he can secure long-term money the Cs can't and shouldn't pay him. He's also presumably discussed this with Ainge and Stevens, and they've agreed to try to work together to find a mutually agreeable and beneficial outcome.
In other words, there's a puncher's chance they have the framework for a sign-and-trade in place, and the details are being ironed out. We'll soon find out, but in the meantime, all the venom is a little much.