The combined salaries of those three next year is about $17.6M, George is at $19.3. While this trade would be acceptable in terms of incoming/outgoing salary, it also means we have to let KO walk and we still would be short of signing Hayward by over $1M (he isn't going to take that big of a paycut). I am assuming this trade takes place sometime this summer.
I don't mind the idea and keeping Fultz, Brown, and Smart is great, but we would need to find another way if we want to get Hayward here. I really would have no interest in the deal without Hayward.
I'm also not in love with the idea of tossing Rozier in the trade as a throw-in or losing Crowder and his killer contract. Avery and the '18 BKN should be enough, but this is what Wyc meant when he discussed matching salaries along with the pick - we end up giving up too much.