Players come and go with the philosophy of the coach who makes them play, unfortunately the coach of Raela Madrid has a team designed and built on the structure wanted by Ancelotti, and this causes difficulties that can lead to tactical errors, he needs time to understand what to change and how to fix it
This is common in football, with players coming and going based on need, especially after seeing their previous performances. This isn't entirely the case, as I've seen several players adapt quickly to Xabi Alonso's strategy. I think it's just a matter of time, as we haven't yet fully seen Xabi Alonso's performance at Real Madrid, and given his abilities, it probably won't be much more difficult.
Some weaknesses may still exist in certain positions like a creative midfielder, as they are crucial for a player capable of controlling the rhythm of the game. Currently, Real Madrid doesn't have a player with this ability, but I'm confident Xabi Alonso can create new players in those positions.