First and Foremost Ozil is like Oxygen for Real Madrid as seen from the 5th May game.
Second forget the comparison with Lionel Messi. Cristiano Ronaldo is at most an average player. He does not assist any one, does not help the defense when in need, Has trouble dribbling past defenders and so on. Examples of his average skills are when he was one on one with Neuer in Champions League Semi Final first leg, Could not do anything. Follow that with his one on One with Bilbao goal Keeper, Again unable to go past him. Forget the quality of his free kicks this season.
I honestly believe that he needs to change his game and become more team oriented. The Moment the likes of Ozil and Di Maria start becoming bit selfish - Ronaldo is screwed.