Yes maybe you are right that in terms of performance Real Madrid is superior today, on the other hand also Barcelona about Lewandowski is still injured and that is quite hitting Barcelona so far, maybe de jong is a pretty good option to replace Lewandowski if he still can't compete, so we still have hope for Barcelona in this match, As long as Lewandowski can recover and compete in the El Clasico match I think Ancelotti can't have much chance of winning, plus the match is at the Camp Nou stadium, it will give more aura for Barcelona to beat Real Madrid at home. Xavi won't allow himself to be bullied in the place he uses for his players' daily training.
When signing with Lewandowski in the last season, Barcelona did not expect to see he gets more injuries and has less contribution for them after only one season. They already succeed with Lewandowksi in the last season, won La Liga together but this season will be more difficult for them. Real Madrid lost Benzema but had Jude Bellingham and some new players. They are a giant club in La Liga and have big ambition to take La Liga trophy back so they will not let Barcelona easily to defend the title.
The absence of Lewandowksi is not worst but his less impressive performance will have negative important impact on Barcelona in general. This will contribute to decide a winner of La Liga but Barcelona luckily got Joao Felix from another Madrid club. The Portugal player together with a big discovery Yamal, might help Barcelona to secure the crown. Barcelona will have to hope that Jude Bellingham will not prolong his good performance and goal scoring for too long.