Not overly impressed when i've seen him, he's alright but Savic has looked better at Atletico than him.
With Laporte you can see his ability although still a bit to go, Bonucci is world class, Stones has great technical ability and is English with still a way to go, those 3 I would say have more pros than cons.
Don't see the logic in buying another unproven foreign defender, who hasn't shown much at all (Atletico are very defensive and rigid as it is) but who has potential.
Happy to be proven wrong but would have Bonucci and Stones ahead of him if price is irrelevant.