I think the Twins are a fine example PG. I think the Rays are also in that category - not because my son plays for them but because I heard Andrew Friedman say they have tried to model their franchise after the Twins. There are others of course.
Obviously, a first rounder out of college should have been a first rounder out of high school but there may have been more risk involved. Sometimes the talent is not apparent to the "group" out of high school. Was Evan Longoria considered a first rounder in high school? Did Long Beach State consider him a legitmate D1 prospect in high school?
Was Buster Posey a signability issue or was he really a 50th rounder in high school? or was he a 50th round shortstop but it was not yet apparent that he was a first round catcher?
What's really interesting about these discussions is that people can cite anecdotal evidence to support any philosophy or to denigrate anyone else's philosophy. Everyone wants to find the next Mickey Mantle, draft them, and sign them out of high school. Sometimes the drafting and signing part works but the Mickey Mantle part is often elusive.