I actually like Napoli’s planning. Does not matter what they talk especially their president. They invest smart, they stay on top 3 teams for about 4-5 years now. They know they cannot compete with you in signing big players due to financial limitations, they hope Juve to have a bad season and to claim the title.
They are not the anti-Juve, i would not be worried of them. On the other hand Inter could be tricky. They can spend big and offer high salaries. Juve is still way above Napoli and this season Napoli is better than Inter. What a day to be a Juve fan.