With Napoli and Inter Milan as two best candidates for Scudetto next season, it makes sense because they have best player resources in Serie A. It's only uncertain about Inter Milan performances as they lost Simone Inzaghi and assigned a very young and inexperienced coach Chivu to replace Inzaghi. If we talk about that with Inter Milan, we must mention similar issue at Juventus with Tudor.
It's surprising that AS Roma and Atalanta have very different odds by changes in their head coach positions, with Gasperini moved from Atalanta to Roma this summer. I truly think both AS Roma and AC Milan will not be able to win Scudetto in a new season.
We still don't know the situation for the new season, but from what we've seen regarding transfers and team preparation, neither team is likely to see much change. On the other hand, Napoli looks set to be even stronger for the new season. They've made several transfers, and I'm sure they'll strengthen their performance. Napoli likely has bigger goals for the new season than just the Serie A trophy. They're certainly preparing for a major competition like the Champions League, which is very competitive.