Ferguson described him as one of the most talent young players he'd ever seen, his talent was never in doubt, he genuinely (Had he followed that progression/ path), there's little in the way of ceilings, he would have been very special. However, there are a lot of these sort, could have's and would have's, he looks set to become a mid table PL player, I'm sure if he knuckled down he could perhaps come top 4, but anything beyond that isn't real anymore IMO but at one point, the stars were the limit.