Best and brightest at 8-15 usually do not end up best and brightest in later career. You can see it even in the fact that average salary of that cohort is only 80k/year - only slightly better than average for ALL college graduates. None of those geniuses are particularly impressive and most ended up doing the same work with the same quality as the rest of us.

There was research that showed that IQ after 120 stops being correlated with success - other factors start being more important.