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Xavi's scheme is not wrong, he knows that this scheme is a scheme that is good enough for Barcelona especially this is their hallmark in competing but I also agree with what you said because for now Xavi's scheme is still very lacking and cannot be applied properly to the current players especially since clubs in La Liga already know very well what they have to do because they just have to continue to defend and wait for the momentum when Barcelona makes mistakes in their attacking patterns.
Actually, Barcelona's attack pattern did not only fail against Girona but indeed in several other matches as well. Their finishing problem is also still quite disturbed at the moment, especially when Lewa, who is the spearhead, still cannot restore his performance like last season which makes Barcelona even more troubled.
But the season is still long enough so there is still time for Xavi to continue to develop performance and restore the performance of the players who are missing at the moment so that they can regain momentum and continue to compete in La Liga especially now that their status is the defending champion.
Barcelona's problem this season is not only about the goal productivity of their strikers, but Barcelona is also disturbed in defense. Barcelona only conceded 20 goals in 38 matches last season, but this season they have conceded 19 goals in 17 matches. Barcelona's goals per game ratio is relatively low compared to Bilbao, Atletico Madrid, Girona and also Real Madrid. These are several problems that Xavi must immediately resolve, otherwise Barcelona will not be able to compete until the end of the season to defend its title.
Until week 17, Real Madrid was the strongest team in defense with only conceding 11 goals. Their goal productivity is also very impressive, but unfortunately Girona, who is in good form, has managed to lead the standings at the moment. I know Real Madrid can easily throw Girona into second place, that's because the gap between the two points is only 2 points.
For defense problems, it seems that Xavi is giving too many experiments that make this not very good for them, such as when sometimes putting Kounde or even Cancelo in different positions which makes their performance not 100 percent maximum because they have to adapt to a new position besides that, this is like what @red4slash said indirectly Barcelona's performance and the attack patterns they make are what makes the defense disturbed.
We know that with the tiki taka that occurs, the quality of Barcelona's attacks, especially when especially when trying to control the rhythm, there will definitely be a lot of players who must be ready in attack, making some of their defenders inevitably have to help attack which makes their defense a lot of gaps that can be exploited.
This is what happens when their attacking patterns are read and indeed conceding 19 goals at the moment is a problem especially when compared to before where they were so strong that they even conceded only 20 goals in 38 games played last season.