Why did trades continue to execute even during Mt. Gox's downtime? The website and API were both down, yet trades were still being made by the bot. The reasonable answer is because the bot was running within Mt. Gox itself.
Perhaps Mt Gox offered high deposit customers an order fulfillment system.
Again, my argument is "Be careful in ascribing moves in the price of bitcoin to the intentional acts of Mark Karpeles.", I'm not defending Karpeles or Mt Gox.
Well, yes, we can come up with a bunch of explanations. But there's no evidence any such fulfillment system ever existed, except a little bit of handwaving from Mt. Gox insinuating it might have existed.
(I know you're not defending anyone, and I really appreciate having a good debate partner. Certainly not looking for an echo chamber. Just wondering how the simplest explanation isn't the best, in the absence of evidence.)