Xabi Alonso is very suitable to be the coach of Real Madrid because with the talent he has, he should be able to bring back the Real Madrid team to perform consistently, previously Xabi Alonso had also been a coach of several big teams so with the experience he has in the past, he might not mind facing Real Madrid players when they are in the dressing room because we often see no matter how great a team coach is if they are not able to face the players well when they are in the dressing room, it will greatly affect the game strategy that is implemented and does not go according to plan.
The group, before management, is the most important thing.
Only with a solid group that helps each other and supports each other can you build a team that makes sense and can win.
If you start making teams only with strategy but without players collaborating, well good luck!
This is a double-edged sword because what you say is not entirely correct in my opinion. It needs a team that supports each other, so much I agree with. But who is responsible for that? You can have teams that get along with each other naturally because the characters match. But you can have teams where a lot of moderation is required and usually in these top teams like Real Madrid, moderation is required because you don't only have 11 superstars, but 20 superstars and all of them want to play 90 minutes every game or want to take the free kicks or the penalties or whatever that be.
First of all you need a certain level of quality or otherwise you won't be able to compete with other top teams in the long run regardless of how well they get along with each other. If the quality is there, the coach is mainly responsible for putting these players together in the best formation possible and to keep everyone in the team motivated and ready to jump in any second with 100% of their capacity, irrespective of whether or not they are disappointed that they were not chosen to be a starter.
Therefore I think quality comes first on that level and then moderation. Once the quality is there and you find a coach who is a strong moderator, which I think Xabi Alonso truly is, then the team is going to be incredibly strong.