Napoli is truly fortunate to have signed Kevin De Bruyne. Although he's prone to injury, when he's fit, his contribution can be truly significant. And I'm confident Napoli will be even stronger this season.

And it's possible Napoli will once again dominate Serie A this season. But other teams have prepared just as well. However, I'm sure we all have even more confidence in Napoli's performance now, especially after Kevin de Bruyne joined the team.
 Napoli is a strong club that is ready to perform well again, and without De Bruyne, Napoli will still going to try their best to lift the trophy next season because they still have potential players that are ready to sacrifice their efforts to Napoli to become a champion again in Italian league.

I'm not saying that De Bruyne will not going to perform well in  Napoli, but having De Bruyne in Napoli in this season it will make the team to shine more in many games that will come their way. Napoli is weak at the defensive level in this season? I don't think they are weak at the back, because there are new strategy they have applied in this season that will make them look like they are weak in the defensive, which is the new strategy on how to secure goals that will make their opponent not to equalize till the end of the game.