Nonsense, sorry that's a flimsy excuse, so you are saying a world-class player doesn't call for the ball in a game because it's not his role?
If you are a player of his supposed caliber, in a big game like tonight, the world stage, against a huge team like Bayern, you don't try show your ability? if that was any top player they would run into space, call for the ball, look for runners play the ball, inspire the team around you to make those runs because he has the quality to find you.
It's what he was bought for, any top class talent would want the ball as often as it was available, when he isn't on the ball he's getting in a better position to pick up the ball again, but he doesn't seem to do that, he should.
He has the ability, it's a mentality issue right now, and that penalty miss at the emirates didn't do much for himself either, he didn't even hit the ball with much conviction, I think he needs to show it on the field how good he is, and off the field train as hard as he can for the next match day, he doesn't look to be smiling and happy right now, now he's injured, I wonder if Wenger has decided to give him a break for a while.