Let's say it like this - Bayern does not even depend on that one striker in front to win matches.
In the Bundesliga 31 of 89 goals are goals of Bayern's forwards...
In the Champions League Müller leads Bayern's scoring with 7 goals - and he is more an attacking midfielder with a lot more jobs than just to convert his chances. He needed 28 shots for his 7 goals in the CL - exactly four for each goal - Lewandowski 4.1 (41 shoots for 10 goals), Messi 5 (41 for 8) and Ronaldo 6.25 (75 for 12)
Müller already has 20 goals this season, Robben 11, Schweinsteiger, Ribery and Kroos 9, Shaqiri 7, Martinez and Gustavo 3
If you take all competitions Bayern has 50 goals by strikers - 71 goals by any kind of midfielders...