Some of the best centre backs I have watched are smaller than Hume. Cannavaro, Baresi, Puyol. All moved in from full back too. Thiago Silva isnt a big lad either. Hume looks like he is aggressive enough, but more importantly composed enough to play in there. He is good with the ball at his feet at as well and the best partnerships have always had a ball playing centre back. Happy enough with him at full back, just wouldnt be surprised if in a year or two he is a centre back.Too slight to play CB permanently IMO. Great full back don’t see why we’d change it. Having Huggins is a bonus because he’s comfortable on either side.