Xabi will succeed but he is facing selection challenges. You cannot keep a player like Vinicius Junior on the bench when he is fit. I am glad the new coach is featuring young players like Rodrygo and Arda Güler but introducing Vinicius in the second half is wrong. We saw his impact immediately when he came in, giving an assist and scoring a goal. The best solution might be letting Rodrygo leave for another club because both players (Vinicius) are too good to be on the bench.
It is better to start a game with players who can propel and project your tactics. Vinicius Jr is not that guy that presses enough. Good thing I saw with my own eyes when they played against PSG during the Cwc. I'm cool with him coming from the bench until he learns to press and also add to his defending skills rather than stroll around. I don't watch this football with sentiment, Vinicius Jr need to convince Xabi Alonso into doing that.