A few posts above there was a discussion about whether Robert Lewandowski departure had an impact. Of course, every departure has an impact for a team. That is also the case at work. When someone leaves the job we do not find a 1:1 replacement. But I do not think that is the question or the problem here. The problem is in the defence. They lost because goals were scored against them. So the focus from Bayern should be the defence.
Based on Bayern's results - they are not that bad, especially the beginning of the season was crazy when it became clear that they can score goals even without Robert Lewandowski... Now after such a great start Bayern have slowed down a bit because they also have to play in Champions League... But I still think they are in great shape!