The worst thing about Maguire's fee was that he had absolutely no experience of anything, despite being 26. He literally had about 50 PL games under his belt and sod all European experience when they made him the most expensive defender ever.
Koulibaly might be 2 years older than him, but he's got 6 seasons of Serie A and more Champions League appearances than Maguire had Premier League ones. He's got years of experience under world class coaches, he's played everyone at international level. He's an experienced head who's world class, Maguire is a project player they overpaid for and made captain. At the moment he's done OK because he's not been properly examined, but just wait until United try and mount a title challenge or get back into europe and he faces better teams under more pressure.
Anyway back to KK, Napoli have to sell this summer really.
They've almost bought his replacement, he's 29 so his value will plummet after this window, and he had a big row with ADL early in the season and wants to leave.
I think this will get done for <70m