Dan - I am and have been interested in this kind of thinking/analysis of how people tend to live in the world and interact with the 'data' of the world for many years. But as I suggested on Bart's thread, I've come to a dead end (sort of, in a way), i.e. everyone I meet is such a mix of elements (me too), and besides, I'm less and less taken by what consensus opinion decides is an 'objective' assessment of people, places, and things; and more and more taken by the individual/subjective response, valuable for the simple reason that it IS individual and subjective. BUT - I do think that, when a person is leaning towards his/her extrovert side, he tends to look for validation of himself and his work OUTSIDE of himself (in this case, with the CLIENT); while if he/she is leaning towards his introvert side, he looks for validation to come from INSIDE himself (in this case, his own STANDARDS of what qualifies as great gca -- even if most others don't see what all the fuss is about.)
Peter