He could have had a hip injury that he was willing to play through in the NHL, but not willing to tolerate that for the AHL. Ego stuff; likewise, his hip injury could be bad enough to be a problem when playing hockey, but not bad enough to keep him from celebrating his own wedding, since weddings are much less demanding than NHL hockey. With a player with his personality, they could have just stashed him in the press box instead of hitting him with demotion and publicly admitting there is nothing he could do to play, because they've entirely ruled it out.
The team also admitted he is injured. In your quest to believe the team always tells the truth, do you now decide they're lying about that? If they lied about that, how do you know they don't lie about other things you've chosen to believe?
The team has admitted he had an injury. Now they're going to try to get his contract cancelled via quibbling about severity? Their case looks weak as hell, and there isn't upside to it. They already muffed it in March, now they're compounding the damage by bolstering the argument that this isn't a player-friendly place.