Why they do this:

Nets get back a future first and 2 good role players. Allows them to still be contenders while also getting a 1st for the future.

Mavericks get the perfect guard to go next to Luka. When Luka is sitting they aren’t a very good team this makes it so they can hold their own when Luka is out and they’re better when Kyrie and Luka are on the floor together. This makes the Mavs one of the favorites to win it all.