Yup, they must be working harder to take any chance to be champions when Inter failed to be secured 3 points in any single match. As far as Napoli able to maintain this chance, so become a champions can come true. But, if Inter getting better day by day in any matches, so Napoli might only become runner up once again.
Napoli must perform consistently if they want to chase the champions this season with a few matches left because I am sure Inter Milan will experience a little fatigue in maintaining consistency and they also need to do some preparation in the Champions League for the second leg. In conditions like this, the coach will definitely rotate because he doesn't want his players to get injured and that is the best opportunity for Napoli.
But sometimes Napoli themselves do not take advantage of the conditions because they lose the opportunity to get a win like when they faced Bologna so that their points are getting wider with Inter Milan who are in first place.
The problem Napoli is that, they are not in their peak form which is a big challenge for them to overtake Inter. However, Napoli can improve their performance and win the rest of their matches, they might be lucky because Inter will find it difficult winning the rest of their matches due to their involvement in various competitions. Inter is in their best form and might not be weighed down with fatigue.