Unfortunately, although these anecdotes are interesting, it doesn't answer the question- what percentage of grade skippers have an outcome like that? The 15 yo valedictorian wears a headdress and comes from a foreign country, which also is helpful in terms of applications for diversity, etc.
I remember a PG boy who was a prodigy who cracked under the pressure. (I can't think of his name and I'm sure others have read about him). He ended up being basically unemployed and his hobby was memorizing trolley car schedules.
Some grade skippers are very successful and some aren't. Obviously, it's complex in analyzing what features make some successful and others not. This is simply food for thought!