Manchester United’s youth revolution is going full-tilt ahead with new signings complemented by contract renewals of the existing crop. United’s current youth crop is the most exciting one in years, as the U18s won three trophies last season, in addition to some already making a first-team impact. The pre-season fixtures have given fans a glimpse at the talent in the academy as well, with the likes of Toby Collyer, Harry Amass, and Habeeb Ogunneye greatly impressing. One player who hasn’t been given much of a chance is Sam Mather, but he has received arguably the biggest endorsement of all. Sa…