As noted, each compiler of a list can set their own rules as to who is eligible.
Until they produce, they are just prospects, although it is fun to dream of greatness to come.
Just a small look back that I saw recently in an article on Jeff Jackson:
> 30 years ago, Jeff Jackson was one of the best young baseball players in the country. A native of Chicago, he was the 1989 Gatorade High School Player of the Year and was selected with the fourth overall pick in that year’s draft.