Bayern Munich's defeat proved that Kompanty is very dependent on striker Harry Kane. When Kane was absent, Bayern Munich had difficulty breaking down the opponent's defense, in this case Mainz's defense, to score goals. This can also be seen from the actual game statistics. Bayern Munich dominated the match with 69% ball possession and released 13 shots, but they only managed to make 1 shot on target and it was ineffective. Without Harry Kane, Bayern Munich could not win the match and this was their first defeat after 13 matches without defeat.
On the other hand, in this match Mainz also appeared very effective and clinical. It was seen that they tried 8 attempts at kicks and 4 of them were on target, even though they only got 31% ball possession but they played very effectively. In the end, Mainz gave Bayern Munich their first defeat in the Bundesliga, this defeat not only made Kompanty have to learn from his mistakes but he also had to be able to play the role of all players without having to rely on just one player. So if there is an injured player he can utilize the potential of other players.
I think they recently have been more dependent on Musiala. Kane is a great player, but he has games where he scores several goals and then has games where he doesn't score. What counts are the important goals and if we leave the game against Dinamo aside, he went missing in the Champions League. In my opinion he isn't fast enough as a striker. He has certain qualities, but he is incomplete.
However, Müller is not the player he used to be. I liked him a lot in the past because he was so freaky, you could never know where he is and what his next movement was going to be. I doubt he himself knew that. But that made him be a different kind of striker although those times when he scored so many goals, also very important goals, have been over for a while now.
The loss against Mainz was a great example of what Bayern lacks and this is more than just Harry Kane.