If you make this trade before the season flips, it works cap wise
Brown for Sheppard, Thompson, Smith, Landale, Eason, Holiday, future 1st's
All in trade for Rockets. They will need depth but VanVleet, Brown, Durant, and Sengun is a really good top 4 (plus Adams and Whitmore).
Celtics get 3 young talented players and future 1st's to add flexibility and start a 1-year tank.