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.