It's hard to being an unbeatable in whole matches of season and during Serie A history only Juventus and AC Milan who able became the champion of this competition with unbeatable status but at that time these teams weren't gets strong contender which mean they are too strong at that time but Serie A currently was different even more competitive than previously because some of mediocre teams can possibly makes big teams slipped and in my opinion Napoli probably will lose once or two times this season but i think they can able to maintain their performance until at the end of this season so Serie A title almost certainly will belongs to them
Yup, I'm also not saying they will be 100% unbeaten this season. However, Napoli performance so far is looks amazing, maybe they can still manage to keep their record in the upcoming 5-9 matches. If this is achieved, of course we will see the signs if Napoli will be the new champion this season. And we know AC Milan must be willing to lose Maignan due to injury while defending the French national team in the world cup, he may not be able to play in January this is a bad conditions for Milan, since Maignan is the key for Milan to become champion last season. Juve still need to prove their consistency which they have recently regained after struggling at the start of the season.