Judging from Chiello's Euro performance(same goes for BonBon) we don't need more than 4 CB, especially with Danilo. Chiello's injuries are behind him and this will be his swan song- he will play at least 25 games.
Rugani is obviously a shitty choice(should have sold him back in the days), but he will do as a deep bench option. Obviously no one wants to end up playing Rugani in a CL clutch match, but we would be better off looking for a defender next year.