He wasn't playing 9 in either Bayern game. In the first one he was on the left wing, and in the second he was in a front 2 with Benzema which lets him play basically the same role but more centrally, he doesn't have to do 80% of a 9's job. What to do with him? Keep him on the left. They've had marcelo doing his running for years already, he just plays like an inside left. Until he stops scoring 40 goals a season they can't get rid of him.