Rarely has the top prospect coming out of the academy been the one to eventually succeed. It's always a player you never really considered.
That really just isn't the case though.
If you look at all the academy graduates in the past 20 years to play a considerable amount for the first team you'll find that almost all of them were among the top players in their year group and often were either u18s or reserves players of the year.
Darren Fletcher - Fergie wanted to give him a debut at 15, reserves player of the year.
Jonny Evans - highly rated and compared at the time to Brown and O'Shea who had come just before him, was a full international before making his debut
Wes Brown - 2x young player of the year
John O'Shea - reserves player of the year
Danny Welbeck - u18s player of the year, England youth through the ranks
Tom Cleverley - is one you can maybe it say it about as by all means he was a bit of a late bloomer and really kicked on ~19 in the reserves and his loans
Darron Gibson - u18s player of the year
Adnan Januzaj - reserves player of the year and by far the best player in his time
Marcus Rashford - u18s player of the year, by far best attacker in his age group, was in the Telegraph's list of best first year scholars, played above his age for England etc.
Mason Greenwood - the best player the academy has seen in decades
Paul Pogba - clearly one of the best
Axel Tuanzebe - u18s and reserves player of the year
Andreas Pereira - reserves player of the year
Jesse Lingard - wasn't the top prospect but he was apart of the best youth team in the country and was still a regular, had England youth caps, and was name checked by Fergie to be a late bloomer due to his size so he was highly rated by the club
Scott McTominay - was indeed a completely average youth player. Although his age group were so shit he was still seen as probably the best midfielder in the group.
I think that's pretty much all of them and from a list of 15 players, only 2 can be categorised as never considered.