I hate to be this guy but until he can consistently perform in a back 4 against strong opposition, we should really not be labelling him as this 'page turned' potnetial World Class centre half. At the moment he has an easy run because he essentially gets to be a 3rd defensive midfielder and press opposition players without worrying about leaving a massive hole in the back. Don't forget before a turn to a back 3, he was a headless chicken and cost us a vast amount of goals because he just can't command a back line. I'd read between the lines; Tuchel and the board are not idiots. There's a reason this has taken so long and it will probably be because they have reservations on his ability in that area. At the moment we can't change from a back 3 because it works for us. The time will come when we do need to and if he then proves that he really is a different player, throw the money at him. He has every attribute you'd want in a centre half but he's proved time and time again, the mental and positional attributes in a back 4 are far from his physical.