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Barcelona shouldn't be in the list because they're struggling to fit into the system of balance. Pep Guardiola is my own favorite coach, he's important and makes football enjoyable because he's always on the top followed by Real Madrid. A club's level is determined by the performance exhibited by the club and their players. Manchester City remained first because their key players have returned to training, remember Kelvin De Bruyne is back and have scored and aissts for his team unlike some players that have no contribution to the growth of their club.
Barcelona level this season is still very far below Manchester City, Real Madrid and Bayern Munich. Maybe they can overcome Napoli in the round of 16 because after being left by Spalletti their performance has decreased, I doubt that Barcelona will be able to reach the semifinals with their inconsistent performance. Manchester City is still able to maintain its performance after winning the trophy last season, Real Madrid and Bayern Munich are trying to avenge their defeat last season to prevent Manchester City from winning the trophy twice in a row.
Luckily Manchester City is managed by a great coach, Pep Guardiola always has the right strategy to overcome other strong teams. I'm excluding Barcelona this season, while Manchester City, Real Madrid and Bayern Munich will be competing against each other to get into the final.