This will be a new turn for Napoli for getting this amazing player and we should sometimes forget the age and concentrate on what the player can offer which I know that this very guy KDB will deliver when the time comes. Playing at Manchester City where his presence put a lot of pressure on opposition in the EPL is what will repeat itself in the Serie A and for ones Napoli have a creative midfielder to support the attack. The partnership between KDB and Scott Francis McTominay will make the squad very strong and deadly to the other teams in the Serie A. I just wish they stay positive to defend their title this time around.
First of all, experienced midfielders like KDB are very rare. Luka Modric and De Bruyne are considered the most experienced midfielders right now.
De Bruyne has an injury problem. Even then, it is not a very serious problem. If he performs a little carefully, he will be able to avoid injuries. I definitely say that Napoli will benefit from adding De Bruyne to the squad. Although Napoli won the title last season, Napolis attack was weak. The team was able to score only 59 goals.
Adding De Bruyne to the squad will strengthen Napoli's midfield. Now Napoli needs to add an experienced striker to the squad. So we will consider Napoli as hot favorites for the Serie A title next season.
I agree with you, these players you mentioned have made history, won titles. For KDB to join Napoli it only means that they need to give him better players to work with if not his stay at Napoli will be useless and about him being injured I think is because of the team and how the manager made him to be, Pep Guardiola made these guys at Manchester City to over work to keep fit and that record 4 in a row that we do talk about and if the players have not given their all I don't think they would have gotten that achievement and him being injured for too long, is like the injury at City was the first time he has sustained such injury and be out for that long. At Napoli I think it won't be as we saw him at City, being injured.
You talked about an experience striker, yes they need one that will be as mobile as Osimhen and let's say the truth, this is when they need the mask man Victor Osimhen, someone like him with his current form, things will be as good for the club and it will make the job for KDB very easy not with Lukaku. Next season is going to be tough and Napoli need to be ready for a very busy schedule, last season it was easy for them so the players need to be ready if not they might fall out of the top 4 again.