If De Bruyne avoids injuries, which is a big if, for sure he would be one of the best Serie A players despite the age. I'm not a Napoli supporter but I have to admit that it is a great move, he can really make a difference, especially in the big matches.
Which is something everyone obviously hopes for, if he doesn't get injured, given his age, with the skill and experience he has he can really give a lot and i think we'll see this soon, another 10 days and the Serie A championship starts.
i am very curious to see how it evolves