It's a wired to see that after all this time there are still some darkcoin owners with so less trust in the coin that they are haveing their coins sitting hot on the exchange waiting to dump them all instantly by the slightest negative news. I thought they are all gone by now.
Actually that initial 15k dump very likely came from masternode operator in south korea according to the block. 15 payments of 1000 drk directly to cryptsy from mn addresses. I don't think those first coins were on the exchange.