Napoli is in great form right now, it's true. And stopping Napoli is very difficult now. The performance of Napoli players in every match is exceptional. There is no doubt that Napoli is their favorite opponent of Frankfurt. Napoli is also in better form than Frankfurt. But don't forget this is the Champions League platform. There is no opportunity to neglect any team here. Frankfurt is not favourites, but they have a chance to win. Last season we saw a mighty Bayern Munich team knocked out of the Champions League after losing against Villarreal. And so if Napoli makes any mistake on the field they are likely to lose.
Every team will not make deliberate mistakes in a match in the Champions League, because any mistake here will become an opening for their opponent to beat them. And Napoli themselves are also very aware that they really need to be able to fully focus on Frankfurt today because it is true as you said that the Frankfurt team also has a chance to win if the Napoli team makes an accidental mistake in the match.