Barcelona are a bit off form right now it's true. However, I think Barcelona can do well against Napoli. Because the performance of the Napoli team is not good this season. They are not able to dominate in Serie A. The team has won only 8 out of 16 matches in Serie A. If they are in good form like they were last season I would definitely consider Napoli favorites against Barcelona. But since the performance of Napoli players is also completely erratic. Especially the team's defense is quite weak. For these reasons, I will call Barcelona the favorite for this match. Barcelona's squad looks stronger than Napoli's to me.
I don't think so, this is a match between two teams who are down this season so anything is possible and both teams still have the same chance.
Napoli with its new coach has not yet found its best performance, as well as Barcelona, which has seen no improvement in performance, but in fact their performance has decreased, we can see this in the last few matches they have played in La Liga matches.