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.
Hopefully, your wish is coming true. However, kinda weird you hope your rival to be fit. Don't you wanna see Juve win the title instead of praying for Napoli's player to keep fit?
This is an interesting point, but often in Italy we are soft fans, that is, we support a team but we love football in general, beautiful football.
Honestly, i don't care if my favorite team loses, if the opponent plays well i recognize it..