I don't understand why someone, even someone who stole a bunch of coins, would dump in a way that tanks the price. If he stole 100k DRK, why wouldn't he dump say 5k per day, rather than 40k? He'd get 2x + as  much Bitcoin and it would just take 20 days instead of 3. I've never seen this kind of behavior with any other altcoin. Makes me think someone is just intentionally tanking the price, but to what end? If the DarkSend implementation goes smoothly, the price will recover despite what any dumper does. I can't think of any possible way for the dumper to profit by doing this.