I don't see Leverkusen as a team that will be a problem to bayern munich again come next season because with Alonso leaving for Madrid I will say that it's an end of era and Leverkusen under a New coach will really struggle so to win I see the days of a one horse race for the bundesliga back
But Xabi Alonso isn't leaving, he has already left Bayern Leverkusen for Real Madrid. I know you already know his left but you're making it sound as if his still at Bayern Leverkusen from your statement. I also agree with you that Bayern Leverkusen wouldn't be that much of a threat to Bayern Munich at least this coming season because they lost some players already and the coach that's about to take over is also a new one. I don't think he will adapt so easily even if he does adapt easily, Bayern Munich will not just watch him take the trophy because I believe they will still want to defend it.
The strategy that each coach has can be different in different clubs because the relationship between the players and the coach should be very strong. Only if their bonding is strong then they will be able to perform well in the field. But if we see that Bayern munich is a strong team, a good capable team and the important thing is the mindset that has been formed about them that competing with them is a little difficult, but we cannot say that it's impossible, Because struggle and dedication are needed to get ahead of them. But if the Bayern leverkusen team pays attention to their strategies and their way of playing, then of course it is not impossible to beat the Bayern Munich.But because the coaches have also changed, we should give them time to see how things are going and goes on,only then can we conclude something.