There was a loss for Xavi because he got 2 yellow cards against Atlhetico Madrid. This allowed Xavi to miss 3 matches. Against Las Palmas, Cadiz and Real Madrid. A disadvantage, because at the moment Barcelona is in improved form. They haven't lost after playing Villareal.
Las Palmas and Cadiz are not tough opponents for Barcelona so I think that Xavi not being able to accompany the team during these two matches will not have a big impact, now Brcelona is in top form with high self-confidence and this will make it easier for them when they meet tough opponents. the quality is still below them.
Xavi will only be able to accompany the team during the E Clasicco, this will be very interesting.
Barcelona by their ranks has no excuse in losing against Las Palmas not Cadiz by virtue of the absence of their coach in any of those games. It is not for team like this that such excuse should be made. So am confident that Barcelona will continue with the winning streaks maintained their position on the Laliga table. Ordinarily coaches absence has a way of affecting players performance and ginger but then for players that understand themselves with good communication flow on the pitch just the assistance of the coaching crew in the absence of the main coach is enough to give them the needed win particularly when playing with an average team.