Napoli is not a favorite at all for the next season. They had a good performance this season and they won the title but since their coach and some players are losing this team I think they don't have too much chance for the next season.
I tend to agree with you on this point. Napoli played fantastically in the beginning then dropped a little and continued fluctuating until the end of the season. This all happened while having their best players and sometimes after losing them to injury. I think the last point show that even with the full squad, Napoli might lose its title.