Recent evidence would suggest that among the young Manchester United players in Hong Kong this week, at least one is on a fast track to the top. It was only two years ago, after all, that a 13-year-old JJ Gabriel came to the city and scored twice in a pair of victories for his United team. Now 15, Gabriel made his first senior team outing in a 2-1 friendly victory over Atletico Madrid earlier this month. Although still noteworthy, Gabriel’s age attracted far less broad comment than it might have...