Xabi Alonso identifying the problem of his Real Madrid team is one thing then another thing is to solve the problem and not let it linger for another season when they start the new season, Ancelotti was seen as the best manager but last season he failed to provide the solution that could save his team from a lot of embarrassment that they witnessed last season but since Xabi is ready to solve the problem I think he needs to know the players he decides to start first so that he doesn't create more problems trying to provide solutions.
Yeah I concur that problem identification is not the final step to the problem. The real stress is how Xabi is able to deal with the dressing room and gets everyone to believe in one goal. Real Madrid consists of large personalities and individual talents and that may be difficult to handle when the players are after individual glory than the teams. At this point, the most important thing that Xabi should do is chemistry and an understanding system in which each player is familiar with the role to play. Provided that he is able to handle the egos and make the team start to play as a team then the next season can be quite exciting indeed.