The fascinating part about Montreal is that all sides have perfectly valid points.
McMahon and Shawn thought Bret took things too seriously which he did.
Bret thought that Shawn was acting extra douchey towards him, which he was.
Bret thought that Shawn was jealous of his enormous payday, which he was.
Bret thought that McMahon purposefully turned Shawn heel to steal all his thunder, which he did.
Shawn thought that HHH and McMahon had a point about Bret being too hung up about where he dropped the title, which is true. You do it at the PPV.
That being said, Bret did have creative control over his character in the last 30 days, which was not honored.
McMahon thought that the future of the company was neither of these men, which was true.