They take a long time, not just 1 year. Xabi at least took almost 3 years to walk. Xabi has consistently improved his performance. Therefore, he was rumored to be replacing Anceloti in Madrid. Because Anceloti has definitely trained Brazil. Xabi is a young coach who seems to have good progress.
The progress that has occurred while Xabi has been at Leverkusen has indeed made a lot of progress at the club. And this season is their best season in performance, in fact their performance is almost perfect. Currently, Leverkusen can be said to be a club that is very on fire and can also make changes in the Bundesliga over the dominance of Bayern. Yes, although we still don't know whether Bayern Munich will soon take over Leverkusen or not. because unfortunately, there are rumors that Xabi and Real Madrid have reached a personal agreement. but whether this will come true or not. If so, then of course this will have a big influence on Leverkusen.
If Xabi Alonso has reached a personal agreement with Real Madrid for me it is a very natural thing, because I think he really wants to be at Real Madrid. He's a former Real Madrid player, and I know he's a Real Madrid fan, so if there's an offer coming from Real Madrid he'll be very happy.
On the other hand, it's true what you say, if he leaves Leverkusen then it will have an effect, because we know that the person who brought Leverkusen to the current form is Xabi Alonso. Leverkusen will have to go back and look for a suitable coach who can replace Xabi and that will be very difficult.
It will not happen this season. He was a former of real madrid but it doesn't mean real can get him easily from leverkusen. Xabi is just starting his career as a new coach from leverkusen and it's all going so well till this time.
Xabi is willing to compete with bayern till the end of season caused by this is also impacting his reputation if he will get bundesliga and try to destroy the domination of bayern munich.
Take a look at the latest update from leverkusen. There have been many offers coming from the various clubs but leverkusen has taken a decision to ruled out all of offers from PL clubs.
Bayer Leverkusen have ruled out selling reported Chelsea and Liverpool targets Jonathan Tah and Piero Hincapie in the January transfer window.
https://www.goal.com/en/lists/chelsea-liverpool-bayer-leverkusen-jonathan-tah-piero-hincapie-will-not-be-sold-january/bltd4496e5e13324ce4Leverkusen is seriously committing with xabi alonso to help the club to get into the UCL next season and win the trophy with leverkusen. Im not seeing the chance of him to leave from the club although the offer came from real madrid as his old club.
I know that if we can try to link him as a former of real madrid player but it's not always about it. Xabi is happy in leverkusen and he will try to stay much longer.
This is a good news for leverkusen and bad news for real madrid if perez was targeting him to replace ancellotti.