Xabi Alonso seems to be suitable for Madrid and to replace Ancelotti, but it all comes down to Leverkusen and his decision because so far at the start of the Bundesliga season it has been seen that Xabi Alonso's performance as Leverkusen coach can bring Leverkusen to control the top of the Bundesliga standings and eliminate Munich as the defending champion. Even though the offer came to him, it is certain that all fans want Xabi Alonso to win the Bundesliga title this season with Leverkusen.
At least Xabi Alonso, if he really wants to be seen as the best coach, should be able to bring Leverkusen to win the Bundesliga title this season. If indeed Xabi Alonso can bring Leverkusen to win the Bundesliga title this season, of course Xabi Alonso will definitely be truly worthy of coaching in Madrid and of course that is also to add to experience coaching and playing in other leagues such as Laliga.
If Bayer's fans are so naive that they expect a Bundesliga title this year, then they needn't worry - if Alonso leaves, it won't be until next summer. Bayern are showing dubious results so far, but still their chances are higher than those of other clubs, take a look at the bookmakers’ quotes:
Bayern Munich 1.24
Bayer Leverkusen 9.50
RB Leipzig 11.00
Borussia Dortmund 12.00
Bayern Munich is of course the favorite team. In recent years, no team other than them has won the championship. Borussia Dortmund came very close to this last year, but they could not become champions because they could not win in the last match. When I look at the odds, the odds given for Leverkusen can be played at 100 dollars. They have a good squad and technical team this year. If a team other than Bayern were to become champions, it would probably be Leverkusen.