Perhaps Alonso's success was possible precisely because Bayern was in crisis, and when everything began to improve, Bayer lost their former confidence and Bayern returned to their former place. I also think that without Alonso, Bayer would hardly have been able to achieve becoming champions, it was a good season and that is why Alonso decided to stay with them, but I think that he had the opportunity to achieve more with Bayern and he should not have refused the offer to become the coach of Bayern.
Yes, the ideal conditions were given to him and he took advantage of becoming champion, but well, they became champions of the Bundelsiga being undefeated, that is something very big, I have been seeing some social networks, there is speculation that Xabi could go to Madrid, it is something that is seen, they are rumors perhaps, in retrospect with this campaign that Xabi has had with Leverkusen in my personal opinion he should not leave Leverkusen, leave when I see that his cycle is over, just as Klopp did in the PL with Liverpool, he laid the foundations for a team that will probably currently be champion in its league.
Xabi will probably leave at the end of the year if he goes to Real Madrid. There is very little time left in the year and it makes no sense to leave the team now. Real Madrid will not let Ancelotti go before the end of the season anyway. Leverkusen has reached a completely different level with Xabi. We need to accept this and think about what a coach who takes Leverkusen to a higher level can achieve for Real Madrid. Real Madrid is currently losing to Arsenal in the Champions League. Maybe Xabi will be in Spain next year but the tactics he left behind will continue with Leverkusen.