Napoli only plays in Serie A, and this is why Napoli players have been able to give their full focus on Serie A . Even then, Napoli's overall performance is not stable. And napoli is not in good form at the moment.
Napoli team has drawn consecutively in the last three matches. However, Inter Milan's performance is also a bit erratic now. Napoli had a big chance to increase the point gap with inter milan. Now the performance of both Napoli and Inter milan is quite erratic. If Atalanta can continue its good performance, then atalanta has a chance to occupy the top spot of the table..
That's true Napoli is focused on the seria A with no other competition to bother about that is why the have been able to dorminate the league so far, interms of consistency they haven't been that consistent the luck they have is just based on the fact Inter is trying hard to balance the seria A league and the champions league matches.
Atlanta has left the champions league competition so the will now focus fully on meeting up with Inter and Napoli so the can cover up the gap and increase their chances of getting higher in the table ranking. Atlanta are currently three points behind inter which means a big chance to push higher taking advantage of Inter's distraction.
The performance of each team in this season of Serie A is quite irregular. There is no team that is able to perform well consistently. Napoli has drawn three of their last five matches. Inter milan has won one, two and lost two of their last five matches. Atalanta has also lost two of their last five matches. Each team is losing points . So we do not see much change in the points table.
The team that can perform well consistently now will be able to win the title. But it is very difficult for Napoli, Inter Milan and Atalanta to continue their winning streak. So it is not possible to predict which team will win the title so quickly.