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 was necessary because his performance and hard work in Napoli was quite good, due to which he is now recovering from injury, due to which he can now play a big role in his team and improve his team. Even if he is not the same, he will start playing in the team to some extent, but he should be able to recover and become a successful player for his team. It is not like that, both of them are very hardworking and good teams whose performance is going to impress quite quickly, but the way Napoli is coming back, Juventus does not play with efficiency, but they are also a successful team.