Vinicius has understood very well that if he continues his haughty behavior in the Madrid squad, he will be out of the squad. Madrid has always been a strong as a team. They do not want to be rely on any particular player. So if Vini is arrogant, then its effect will be seen in Madrid's overall gameplay and Madrid's attacking performance will become weak. If this happens, the Madrid management will definitely decide to sell Vini. And that is why now we can see the friendly relationship between Mbappe and Vini.
Xabi Alonso is nothing alike Ancelotti indeed! He doesn't make any player feel like their place is guaranteed in the starting lineup. Even one of the stars like Vinicius Junior found himself on the bench...
Yeah maybe not the majority would do the same already on the first weeks. But this is good for reminding a player to perform better.

He made a nice assist after entering. Teamwork comes first so I hope Xabi Alonso ensures it in time.
We saw Rodrygo as a starter in this game. Does this mean he isn't leaving this summer you think?