The thing about Xabi Alonso is that he has done great at Leverkusen, which is why everyone highly regards him and he deserves all of that right now. But being the manager of a huge club is not easy, being expected to win nothing and do more than you should is a great feeling and makes you regarded highly, however being expected to win anyway, means that if you win then that was already expected, and if you lose that would be terrible.

Do imagine him getting the spot after Ancelotti, he would be managing Real Madrid, if he wins the league, that was already expected, Real is a team that should win the league anyway, and if he loses, second place is not uncommon, Barcelona does win time to time, but he would not be loved all that much, and at UCL he should try to win too, and if he loses anything but semi finals, then that would be terrible too. Expecting someone to do better than expected is easy when at Leverkusen, not so easy when the expectation is the title.