He clearly lost the team, but the awful build of this roster never helped him out in the first place. Not to say he hadn't been outright shytty in the last little while either.
He had Dragic/Bledsoe in a perfect pairing and ruined it by making Bledsoe the PG over Dragic even though he was fine as the SG. That was the start of his downfall as they've been pretty much shyt ever since. He had Isaiah off the bench and couldn't get that to work either. They had a lot of great pieces that they just never kept or got to gel and now they're stuck with a bunch of mismatched parts.