I wouldn't be too sure about the assumption that Napoli is out of business for the top four.
Napoli are not out of business in top four race yet. They are only 8 points less than Bologna and because it is Bologna, Napoli still have good chance. Bologna have good defense but their attacking power is not too good that can cause them to lose point when they fail to score winning goals.
I believe a biggest competitor of Napoli in this race will be Roma which have more experience in top four racing and Roma are on fire with De Rossi too.
Now for Napoli the job is a good bit harder I admit. But I think that they are still in distance to strike back and to make up for some points if they can win some games in a row. So nothing is over yet for them and by the way they are still in the Champions League. The first game didn't look all too promising, but let's see.
Napoli have a hard task to complete but with more than 10 matches till the season ending, 8 points less than Bologna will not be impossible to equalize. Napoli have been showing their recovery and return to good form recent matches. Their main challenge from now is to maintain their own good performances, then their chance to catch top four will become bigger match by match. Bologna and Roma will surely lose points so the main task for Napoli is to play well enough to take advantage of dropped points from competitors.