I agree. Kovacs tactics, as far as i could decipher them, seem to be: provide a solid scaffolding of defense and midfield hat can gain and defend the ball, in attack rely on individualism. That works as long as Bayerns individual class is better than that of the opponents. It fails if the opposing coach has a good idea to outsmart this system (BVB) and/or the opponent is of an even higher individual class (=all of EU top teams).
Agree that Sanches is very likely not staying (godspeed!). Local media is murmuring they want to get Emre Can back, which would make no sense at all.