Well I'm not in the group of the people that said anything about him not "wanting to be here", so at least don't put me in the criticize anything group.
Also, I used quotation marks for the words kill and vacation for a reason, I'm not being literal here, but I think it's safe to assume that the easiest way for a guy like him to earn Mou's trust is to be a 101% professional until the end with Valencia, show or at least pretend that he somehow could gel with the squad and leave the team being praised for acting like a great professional, not creating doubts about that.
My literal interpretation of that situation is that he just showed he's not mature enough with his actions, now you can put him a United shirt and somehow he could turn into a role model next september, but right now, If I had doubts about his quality as a player to decide if he deserves a spot next year, him showing that lack of commitment wouldn't help me rate him higher.