As Louis Van Gaal takes his leave of Old Trafford, the veteran Dutch coach will reflect on his legacy of the latest batch of young Red Devils graduating through to the senior team at Manchester United. The star pupil of the Class of ’16 is undoubtedly Marcus Rashford who can cap his meteoric rise by making his England debut this week. The Manchester-born striker made his United debut only three months ago and has made such an astounding impact that…