Why no talk about DeRozen? He can force San Antonio's hand by opting out or allowing them to trade him to where he wants to go to while the team trading for him retains his Bird rights. It's absolutely possible for Miami to net Aldridge(trade) and DeRozen(trade or FA) this offseason.
Since Miami is in a unique situation with their cap this offseason and next, swing for the fences and show Giannis Miami are willing to make the moves...
A trade to Miami may look something like...
Iggy, Olynyk, Nunn, and a FRP(draft for SA this year) to San Antonio for Aldridge AND DeRozen(or opts out and signs a 1 year contract with Miami).
https://tradenba.com/trades/IyYWYEyd2San Antonio gets much younger with Nunn and FRP plus gets a stretch 5 for backup behind Poeltl. Or San Antonio keeps both and possibly trades them at the deadline for much less and possible bad contracts past 1 year coming back.
Or something like this could happen.
DeRozen opts out in San Antonio, agrees to long term contract with Miami but less per year to keep cap space available for 1 max contract player next offseason.
Miami resign Dragic, Crowder, and then trade for Aldridge for Iggy, Olynyk, Nunn and/or pick, then Miami resigns Dragic and/or Crowder at team friendly contracts. Dragic and/or Crowder may have to have their cap holds released and accept exception type money which they might.