Celtics get off Jrues contract and get Rui in return, who should be able to fill in for Tatum while he's injured and play hard to earn a contract elsewhere by the time Tatum comes back. Vando as a throw in.
Lakers get rid of 2 contracts in Vincent and Vando, and send out Knecht and Rui for some experience and defense in Jrue, and a rim protecting, switchable lob threat that would work perfect with LeBron and Luka. Reath could be something, he can shoot. This also still leaves Klebers expiring contract to use in any other trades.
Blazers help with salary and make room in their overloaded center spot (Ayton, Clingan, Williams, Reath, etc.) and get a good young talent for it