Assuming Satoshi Nakamoto really a. actually existed and b. disappeared by his own choice.
How many bitcoins did he mine during development of the theory, and where are they now?
What about that never-touched cache of 1500 bitcoins mined in 2009, that turned up during the MtGox hack series of events?
http://www.reddit.com/r/Bitcoin/comments/i4xgc/follow_the_money_trail_part_2_1500btc_generated/