These scouting reports/player comparisons are entertaining but almost useless. Trying to predict the future of a 19-year old like Anderson is a fool's errand and trying to set a "ceiling" (.270/20) is just plain silly. VERY few players in any draft are "can't miss" (i.e. Strasburg) and a good many of those "can't miss" players do end up missing. Without looking it up, I'm sure the MLB is full of players that greatly exceeded the projections assigned to them by the scouts/media. Baseball is unique in this regard. None of the other major sports are as speculative/inconsistent when it comes to projecting future success. Football is probably a distant second.
Anderson may bust, but he has things that can't be taught. But I would agree that the Sox haven't done a very good job of developing players of his ilk which is the only thing that gives me pause.