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If Rodrygo gets more opportunities, I'm sure he could achieve much better performances, as he's quite good. Real Madrid's weak defense is due to several key injuries, preventing the coach from fielding a full squad for matches. The arrival of two new players this season will improve Real Madrid's defense, although they will still need time to adapt. Xabi Alonso's task won't be easy, but I'm confident he can overcome these issues over time, as achieving success in a short time is no easy feat.
Like you said, players like Rodrygo requires much playing time in any team they are in order to excel. On the part of Alonso changing situations in the team to create that quality Real Madrid are known for, it's going to take some time as he can't get things right just immediately. The only position in real Madrid squad is the attacking positions. Next season I probably not be expecting the midfield and defensive positions to be as strong as to give them a competitive team anywhere even though they get to buy new players.
We always see it like something that is easy. For Alonso to come to Real Madrid and decided not to play Rodrygo who has been seeing football in the tenure of Ancelotti means that something is wrong. Alonso has been saying he saw a tactical problem and in the few matches I watched him, he has tied to solve it but it doesn't work.
The last one, their keeper said they couldn't deliver what the coach told them. These means that it is at the side of the player to implement what their coach said.
If this eventually continues, I see Real Madrid running into bigger problems when the season starts because pressure must come and Vini and Mbappé will continue their unspoken competition.