I don't get the problem here. If he is a top defender, young, fast and tough and CB has been our weakest link this year, why is anyone against it.
Kompany is injury prone, and not currently playing well. Demichelis is one year older. Boyata says he is considering being off.
So here is what we are left with one young defender who hasn't hit his full potential yet in Mangala, an injury prone Captain who has been off form all season and an aging vet.
So why are we opposed to bringing in talent for competition? If he is as talented as been suggested, then I will welcome his addition. It has been an underperforming position.
And as for the youth team defenders, if the youth players are good enough, they'll make it and if not they'd be moved on for a profit with buy back first options.
Let competition and merit push the best to the top, and the rest can be moved.
Unless some want to argue he isn't good enough, if he is, and we are weak at the position, get him.