Too many butthurt people here. The things he's been doing lately I can't see any other reason but to force his way out. So he's clearly not being stupid, just a douche bag.
Is it disrespectful? Sure but who the fucking cares... We paid his salary, he helped us get to yet another final. So whatever.
Let him go, find a replacement and move on.
At this point it doesn't matter we won't be able to find anyone close to his level at his role, just find someone solid.