With the arrival of KDB, at least, Napoli's strength can be further increased, as an Attacking midfielder, he not only focuses on increasing the club's attack power but he also has intelligence as a playmaker that will be very useful for Napoli. Moreover, for now, Napoli's current attack is only Lukaku who is indeed prominent. KDb's performance will not be completely back to what it was before he was injured, but if he can be optimal, he can still strengthen Napoli quite a lot, what is important is that his injury does not recur.
Napoli tried to do their best after successfully achieving the Scudetto title and they did not want to happen like the season when they won the previous Scudetto because the dismissal of the coach and a number of players who went made their position in the Serie A standings declined. A number of positions began to be strengthened and Napoli managed to bring in KDB in this exchange in a free way of transfer, even if seen KDB's performance decreased slightly like his last season with Man City, but I am sure he can give the best.
The presence of KDB can make Lukaku more dangerous on the front lines because there is a creative midfielder who will always spoil with measured bait to him. We'll see how KDB can provide the best even though his age and quality are no longer the same as the previous two seasons at Man City.