I suggest taking IQ scores with a large pinch of salt in general. Beyond 130, they do not appear to make a useful determination.Further, character and moral fitness determine how useful that intelligence is. A person of high IQ but low common sense or low moral stature will tell you half the truth in order to make it more enigmatic.Pirsig is probably a case of this, although I did enjoy his book.
Really not true Brett, Stephen Hsu's blog and youtubed presentation related to BGI has some studies that show +3 SD scores even as a teenager predict much higher levels of achievement, and most extraordinary achievers in science have such IQs as adults. Gladwell's theory is nonsense.