He was a phenomenal defender at peak of his powers, imo he got robbed off winning the Ballon d'Or in 2019, deserved to win it that year with the season he had, think he fell short by 7 points. But, he has never been able to replicate that level ever again, he has still been pretty good, but these shouts of "best defender ever", "best PL defender ever" are very strange to me especially when you consider how many incredible defenders have played this game, and have done it a club, international level for well over a decade, some two (such as Maldini).
He has declined and the system they are playing this season is leaving him and his CB partner extremely exposed. Yesterday was sheer frustration from him to give away that penalty and cost them a result. Will go down in pantheon of great PL CBs, but the unequivocal status quo which many were building was more on hope than reality.