In Doc’s post game interview of the 2nd New York game, a game where the Celtics blew a 10 pt. lead in the 4th quarter, he was asked if the reason he didn’t put JO back in the game, instead of going with Baby, had to with JO’s health, and he said no it wasn’t, and that they had quite a debate about the matter on the bench. In the third NY game, JO played the 4th quarter and the C’s ended the game strong, as they have been playing their best defensively with JO all along.
If JO’s knees were not the reason Doc didn’t go with him in the 4th quarter on Sunday, then it’s amazingly and costly bad decision making on his part, IMO.