As a big fan of Mourinho and his career as well, you bring up a good point about maybe him loosing his passion and drive. But it is well known that Manchester United was always a club that he wanted to manage, and that the Premier League is his favorite league, so I find it hard to believe that managing such a big team as Man U isn't enough to drive him to be his best. But rather that the other teams right now are just better. Better players who have better chemistry.