Why the Bulls do it:
They get off of Thad's contract and open up more minutes for young bigs
Conley can mentor Coby and be a stable ball handler. He can allow LaVine to play offball and also provides some leadership.
Utah's first round pick
Why the Jazz do it:
Porter and Young add wing depth, defense, and shooting (particularly in Otto's case)
Mitchell should be the primary ball handler and PG, so while Conley was great in the playoffs, wing depth is more important for the team fit
Shaq could be signed with the BAE, but including him in a sign-and-trade makes more sense.