Just read this. Honestly, I've never thought Doc was a great coach:
"Two philosophical points of contention between Rivers and the organization were, more recently, his insistence on playing backup center Montrezl Harrell over starting center Ivica Zubac and, at large, his reluctance to develop or empower the team’s younger talent throughout his tenure.
After a Sixth Man of the Year regular-season campaign, Harrell missed a month in the bubble due to the sickness and eventual passing of his grandmother. Upon returning, he was visibly not himself, offensively or defensively.
Yet Harrell’s postseason role was that of an effective rotation player (18.7 minutes per game), despite the Clippers posting a team-worst minus-11.6 net rating with him on the floor in the playoffs, including a mind-blowing minus-30.1 net rating while sharing the floor with Leonard and George.
In comparison, the Clippers had a plus-17.7 net rating with Zubac on the floor in the playoffs and a plus-11.1 net rating with Zubac alongside Leonard and George, with both marks ranked No. 1 among the team’s rotation players.
It was clear to many that Zubac was the better matchup on both ends versus Dallas and Denver. There was an internal thought process of “How does Rivers not see that Zubac is the more productive player and the better postseason matchup?”
A common criticism from some within the team — inside and outside the locker room — was that Harrell’s energy and effort was only consistent on the offensive end of the floor, multiple league sources said.
Meanwhile, Rivers maintained, publicly to the media and privately to his staff and the organization, that Harrell was the better player, in spite of all of the evidence to the contrary."