Agreed, but I'm not sure Mourinho wants to go through the "Özil process" again because of how poor it went in the big games. Obviously, as you said, they're talented players and can come up with massive assists (Özil to Ronaldo which clinched the league), but in the context of Mourinho's style, he's simple not brave enough to have Mata as a #10. It was weird seeing Özil leave Real Madrid, but it was expected. Under Ancelotti, off the ball, Ronaldo moves centrally, while Özil has to cover the left, which is too much defensive work for him. IMO, Mata can play the inverted winger role brilliantly, but I suppose he needs more confidence... Or he can always leave.