Bring back Doc. He had his faults, but he's a vet coach who's managed a wide range of NBA personalities and would know how to handle these guys. He got Pierce to mature and turn into a legit NBA finals MVP, which took a ton of work, and he kept Rondo in check long enough to win a ring and get back to the finals in his time here. Rondo was as tough a challenge as any coach will get. Heck, he got Embiid to play at an MVP level and Harden to become an assist leader. Doc would have no problem calling out Tatum, Brown and Smart and would push them to be the players they should be.