I understand what you are talking about. For me, there is nothing wrong with Xabi Alonso coaching Bayern Munich next season because Bayern Munich and Bayern Leverkusen are not on the same level. Xabi Alonso's good performance at Bayern Leverkusen is for him to get a bigger contract from big clubs, which is already working out for him.
However, if Xabi thinks the same thing as me, then he can stay at Leverkusen, because Leverkusen itself is certain to get a place in the Champions League next season. That way he can show that he is a coach who can really compete, he has to prove that because so far many people have said that this is Xabi's luck.
Xabi Alonso has proven himself with Bayern Leverkusen this season in the Bundesliga. With the help of Xavi Alonso, Bayern Leverkusen is one of the most consistent clubs in the top five leagues. Bayern Leverkusen is still unbeaten in the Bundesliga, and they are leading Bayern Munich by 10 points in the Bundesliga table. I don't see this as luck, but as someone who knows what he is doing.