Wasn't sure where you were hoping to have links to old Ned/Dan/Steemit statements about the ninja mine sent @aggroed, but this seems to be the oldest mention.
Down about 3/4 of the way:
We have secured ~80% of the initial STEEM via mining. Our plan is to keep 20%, sell 20% to raise money, and give away 40% to attract users / referrers.