Even if Barcelona can get 3 points from Mallorca, it still means that the difference is small. When they lost to Las Palmas and were held to a draw by Celta Vigo was the starting point where the gap with Madrid could not widen. Perleu recognised that the absence of Lamine Yamal was very bad for Barcelona. Yamal lack of through ball meant Lewandowski and Raphinha were overwhelmed. Yamal is the player who has carried Barcelona this season, he is able to move freely in the opposition defence, is able to provide accurate passes and you could say he can always open up goal opportunities.
Barcelona is still at the top of the table. Barcelona is 1 point ahead of Real Madrid. However, Real Madrid has 33 points from 14 matches. Barcelona has 34 points from 15 matches. Madrid has played one less match. The match against Valencia was postponed due to flooding. If Madrid wins this match, Madrid will be at the top of the table.
Barcelona has played badly in the last three matches and has lost points. Barcelona's overall performance is a bit unstable, which is easy to guess.
I don't know why Hansi Flick didn't keep Yamal in the starting XI against Las Palmas. But I think Hansi FLick should have kept Yamal in the starting XI. Hansi Flick made the same mistake against Osasuna. And Barcelona suffered its first defeat of the season. Hansi Flick needs to be more careful in match strategy and formation.