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They do not have to be great right now this season, they had a horrible start of the season that is true, but not like they fixed all of their problems. It is true that Xavi has been much better than Koeman but I am sure that koeman is furius and yelling at TV screen "if you gave me those players like auby+traore+torres then I would had better results too!!!" and that is why the real difference will always be roster change.
Barcelona needs to get better players and all that, but they do not have financial means to do so, which means that maybe it will take longer than just one year for them to turn things around and start being champions everywhere.
Yes, better players are always going to produce better results but we can not deny the fact that Xavi had a lot more impact on the team compared to any previous coaches. He lifted the morale of the team.
I know that obviously all the problems have not been solved but some problems have and I believe the other problems will also be solved over time. It's obviously going to take time. I think they have a chance to do well in the next season but even though they don't play very well, like finishing first in the La Liga or winning the Champions League I think they will get close.