Study vs Natural Talent

You're a seasoned tourney player, you've studied plenty of theory and you're all booked-up. Condident in your "chess education", one day you sit across the board to play blitz against some guy, whose name is "Parramatta" (would you believe?), who has never read a single line of theory and bang[!] - he whips you. Thank God that didn't happen to me today - but, it did happen to a strong player. Poor fellow. He couldn't believe it.