He is about to break every record available as it seems. First of all, he started with making Leverkusen the first ever undefeated champion in the Bundesliga history. Now he is going for finishing the season with 3 titles by not losing any game as well. This must also be some kind of a record. I don't believe there is any better achievement earned than this by another team so far. I don't remember any manager who started their career this spectacular.
The fans are very happy that Xabi has managed to offer them something very valuable this season. And they must be very happy, because in the midst of offers that came to Xabi, Xabi decided to stay with Leverkusen for next season, they will certainly feel very proud and feel very appreciated by Xabi's decision, because he did not immediately leave Leverkusen after he achieved great success.
It's true that football sometimes works like that, and this is actually just a link, I mean people attribute Bayern Munich's failure to making Harryu Kane the scapegoat. Even though this has nothing to do with it, in my opinion, because this is not an individual game but a team game.