Celtics: Trade Kristaps for two centers who are more likely to be healthy all year. And one contract is expiring. They didn't use Kristaps in the whole playoff run - get depth and flexibility.
Pelicans: Get the perfect vet big to play alongside Zion - one who's big, stretches the floor, and plays defense. Also get an expiring vet who can contribute in big games. If Zion can stay healthy and trim down a bit (HUGE if), they move into that top tier.
Clippers: Get a center who can stretch the floor along with Brandon Ingram on an expiring contract - he'll be able to contribute in a real way this year, expire next year and the Clippers can either S&T him then or keep him if he's a great fit.
Nuggets: Get Westbrook, who they're rumored to be interested in. They also get some young depth that may grow into replacements for players they've lost the last couple of years (Brown, KCP) and get off a contract that want to remove.
Raptors: Collect some younger players, including Yves Missi who I think will be a great fit in Toronto. Also get some draft capital to start making some good moves.