Indeed, that is not too far a distance if you look at the remaining matches in Serie A, but the problem is that Napoli have not shown a decline in performance which will make the distance of points thin. They always make the most of the games they play, and in performance they are stable and don't appear to have any problems that would make their game not good. One by one the opponents that confronted them they succeeded in defeating. If other teams can not improve performance, then Napoli will move comfortably. And in fact the current rival team does not look ready to tackle Napoli.
Napoli are already getting ahead of their rivals and the match against Empoli can only strengthen this advantage if the other teams continue to lose points. But you know, sometimes unexpected results happen in such obvious matches. The championship is gradually approaching its equator and Napoli are doing everything perfectly, if they manage to increase the gap a little more, then we can already talk about winning the title.