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If he wasn't successful he'd probably be quite a different person in practice - he wouldn't have had the money to do most of what he currently does. And that's quite apart from the question of whether he'd have been in the plane-crash that gave him brain-damage, and how that would have affected his personality.

Based on what he does, though? If there was somehow a person who's involved in all the different stuff he is but somehow without getting major recognition or money for him (and that was not in and of itself a notable trait)? Yeah, I get the feeling he'd probably still be interesting.