My first preference would be for us to trade the #3 pick for Porzingis. Whatever minor player adds to make that work even if it is Crowder or Smart. If this can't be done then how about this:
Boston trades the #3 and next years Clippers pick to the Kings for their #5 and #10 spot. Take best player available at #5 (Tatum, Isaac, etc) and then trade Bradley and Zeller and the #10 pick to the Spurs for Aldridge and the 29th pick.
Why for Boston - Boston still likely gets the man they targeted at the #5 spot while picking up another first rounder this year. This solves the upcoming issue with Bradley likely leaving and helps with the logjam at guard. (Smart and Rozier take those minutes) This frees up even more cap space to be able to go after Hayward. It also gives us a lot more strength down low and we can let Amir fade away.
Why for Sacramento - This gives them the ability to move up those two spots and maintain another first rounder (more than the one for two that some are suggesting).
Why for the Spurs - They are able to add a very good guard in AB and likely be able to sign him long term. They add a player in Zeller as well who could do well in their system. They get out from under Aldridge as well for this top ten pick they are said to be after. The numbers work in the player trade.
Thoughts?