Before jumping saying the trade is unfair read below as to why and when they would do it

Pistons: news is duren wants 30mil plus and pistons are unwilling to do that. Lakers have cap space to do sign him outright. This is a fair value they get for someone they would be losing during FA.

Heat: Another failed season probably, bams wants to leave, better to start clearing large contracts and free up space. They could resign rui to a team friendly deal of 18 mil , so that would make them younger and save 12mil next season