Why Brooklyn does this: AD when healthy is the best player in this deal he's younger and better on the defensive end than Kyrie. Whilst health is a concern, to get out from the Kyrie situation with AD who is a young highly skilled big man who when healthy can be decisive in helping lead a team to a title is a decent return given the alternative is losing Kyrie who has already diminished his value in a year's time. Russ gives you a lot of potential cap flexibility as a huge expiring contract and the pick gives you more potential trade currency for the future.

Why LA does this: given the Lakers recent history of trying to contend in spite of ADS health struggles moving off the big man and reuniting LeBron with Kyrie might represent the franchises best and final opportunity to build a contending squad around LeBron as he moves towards the end of his career. Simmons is a versatile and athletic wing wing defender guard defender who despite having limited scoring ability when healthy is potentially someone who can run an offense due to his great playmaking skills whilst guarding another teams best player.