Teams across all leagues will be tinkering with what Guardiola did this past season with his full backs, and Stones moving into midfield. Woolwich were at it most of the year with Ben White and Zinchenko. Postecoglou (going on small sample size of probably 10-12 games watched since we appointed him) doesn't have just the one way of utilizing full backs. Sometimes both bomb forward high and wide, sometimes one will sit beside cb's for most of the game, sometimes one will repeatedly make underlapping runs (inside winger into box), often the left back will come insde and spend the whole game rotating possession from a defensive midfield position. We have a wide variety of skillsets at full back, with our right backs in particular its a shame we don't have European games to give them all a fair go of it. Emerson, Porro, Spence all good at different things. Left back I'm a bit worried about, I thought Davies was a decent lcb in a three, don't really think he's much good in a back four.. Udogie is a developing, unrefined player and Reguilon/Sessegnon can't be counted on, but wouldnt be totally surprised if Ange decided he liked one or the other.