Few options to get down to 15:
Option 1: cut Joe Johnson.
He doesn't really seem up to speed nor have the trust that Langston has. Non-guaranteed contract. Easy
Option 2: Trade Langston and Thon to Memphis for Kyle Anderson
No clue if Mem would do this; maybe needs a 2nd rounder to make it happen. but would free up minutes at SG, depth and defense at SF, and saves about $1M in cap space.
Option 3: Trade Khyri and Thon to Knicks for Ntilikina
Again may need a 2nd rounder to make this work. But gives us potential leeway to move Reggie if things go south and a young PG to develop (who also could be a good teammate for Dombouya's transition). Money is basically even, but does save about 100k. Knicks improve their front court depth
These are the simplest moves. I'm sure there are some more exciting moves that could happen.
Thoughts?