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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.
You may be right, or you may be wrong about Las Palmas and Cadiz. Both teams are often underrated, but they could be the team to stop Barcelona's good run towards the end of the season. Cadiz will be fighting to get out of the relegation zone and they don't care who the opponent is, meaning Barcelona could be stopped if Cadiz really plays without pressure.
In April, Barcelona have a busy schedule and they need to approach it carefully. There is a match against PSG between the two La Liga matches, so they cannot relax in the hope of winning against the two middle and bottom teams in the end. De Jong and Pedri are still injured, as is Gavi, so they don't have many options if some of their main players enter the treatment room.