33 years old KDB is having his best at Manchester City in last 10 years, and they were expecting to keep him, but he wants to leave and now have engagement with Napoli which is also good decision because this will be top level soccer with have participation in Champions League.
33 years old is not old enough for Serie A standards so this can still be used as an opportunity for KDB because after all he still has the opportunity to make his performance at Napoli rise again.
We know that compared to competitions in other leagues, Serie A is quite friendly for old players so this still allows KDB to regain his performance even though it may not be the same as his prime at Manchester City but he is still very much recognized in the midfield in Serie A.
I think for now even though some people might doubt KDB a little but I think he can still do the best for his new club just like other old players like Zlatan at Milan and some other great players. This is still a good opportunity and I still feel that KDB can still provide hope that matches the expectations that many people think of him.