Xabi Alonso still has a lot of time to develop the Real Madrid team and from what happened in the Club World Cup I don't think it can be used as a reference because Xabi Alonso still needs time to adapt and also Xabi Alonso has proven that he is a quality coach when handling Leverkusen so the same thing is also possible for him to repeat again with Real Madrid.
It's only been a few games, and Xabi Alonso has only had his first few games as Real Madrid manager. They lost to PSG, who are the best team in the world right now, so I think Alonso can learn from that game and make Real Madrid even better. Furthermore, Real Madrid have defensive problems, and Huijsen and Trent didn't play in that game. With this team, I'm sure Alonso will be successful in his first season as manager. He worked wonders with Leverkusen, and with a team like Real Madrid, I'm sure Real Madrid will win their first treble with Alonso.