John Stones was also a 'very promising' player once, but he has not improved as much as people thought he would. It just shows that all this talk of which players could improve or not is just pie in the sky as no one knows if or how a player will or will not improve from the way they play now. Not one poster would put their life savings (if they have any) on saying definitively that player X, Y or Z will become a great player in the future, unfortunately for Ole, and every other manager, they have to make decisions on these players, and some will succeed, and others fail, as was shown with SAF, he made some inspired choices, but also some poor ones, as has Guardiola. We all think we know football, but to be honest the vast majority on here know nothing compared to the guys with the big decisions to make, although I, like most on here, will still put forward names that we think will succeed at Old Trafford, and we will say, told you so, if they are signed and do well. By the way, I think that Mengi looks the real deal, and in a couple of years he could be holding down a regular place in the first team, by what do I know?