Why bother hiring another coach? Obviously the players are in charge.
I'd be livid if I'm Adrian Griffin. The team swaps Holiday for Lillard and guess what happens... the offense gets better and the defense gets worse. Their winning percentage is exactly the same. Point differential the same. Every single player is performing pretty much the same, except Lillard is getting 3 less FGA than he did in Portland. Middleton, Lopez, Portis... same guys doing the same things.
Breaking news, Lillard played his entire career with a green light in Portland and there is some adjustment 40 games in to all new teammates, all new system, and being the 2nd fiddle to Giannis.
You couldn't script an outcome that was more *exactly* as expected. For that, you fire the coach at midseason. Just save some bucks and have Lillard/Giannis share the role.