They see his achievements, see KDB's ability as one of the smart players especially on the field, as a creative and smart playmaker to open up opportunities. Although previously at Man City, his performance declined due to several injuries and also internal problems, but now, at Napoli, his role will certainly be crucial, with his ability, maybe it won't be as optimal as before, but it won't be bad. He is a professional player for at least the next 2 years, he is still very valuable and has high potential.
I think Kevin De Bruyne is the best midfielder who proves himself in several times. By seeing his records , different clubs want him. Because when he was part of Manchester city his performance was brilliant and he was the one who made Manchester city to win many titles and trophies. He is a player who always played an important role to boost up the morale of the entire team. But now kevin De Bruyne is the part of the Napoli team to set new records over there. Napoli is the best team from all perspectives but now Kevin's inclusion in Napoli will bring a different face of Napoli. But one thing about Kevin's which i personally like the most is his dedication towards the game and he delivers his best in every game.