He has taken the next step in his career quite well in Sevilla this season, being really reliable in both DM and CB in games like the Barca one, despite Sevilla getting owned. Watch this season which is likely his breakout season, instead of FM mumbo jumbo.
And regarding argie defenders, dont see much of anything coming out, except Garay, though is more of a Marquez or Chivu type in being excellent footballer then topnotch defender first. Gonzalo Rodrigues would be as classy as Chiellini if he ever stopped getting injured.