Why Portland do this:-

They are defensively horrific, being part of a 3-team trade that gets them a solid 3+D wing would really help them here.

Why Utah do this:-

It seems unlikely that despite what Utah have said that Gobert will be with them next season, so assuming that Gobert does leave. They'd want to re-tool and getting Lonzo and Vucevic plus a #18 FRP CAN allow them to draft Agbaji who could instantly be an impactful 3+D guy.

Why Chicago do this:-

Vucevic does not fit them and while Lonzo has been good for them, Chicago would be better off if they gave him up for a DPOTY-level center in Gobert.