I think it's just as likely that only founders who fit that behavioral profile tend to do well in YC. Assuming that YC is representive of the world would be a mistake. There are a great many startups created differently outside YC that are very successful.

I also find it hard to imagine a lot of the most successful people I've known fitting this profile. Some maybe, but not most. In fact it's a profile, that as you point out, pg himself certainly does not fit.