(a) 650 bitcoins were dumped onto the market.
(b) 650 bitcoins were removed from the buy side by one person.
(c) 650 bitcoins were removed from the buy side simultaneously by many people.
(c) is highly unlikely. You seem to think that (b) is the answer. If that's the case, then the buy side for factom is in fact very weak. Fortunately its not. After the mega dump, the buys were all sold into. Well that's what happens when you dump. Recovered almost immediately as everyone wants to buy cheap.
Actually I removed my post because I realized I didn't want to get into a discussion about it.
None of your options are adequate but try out linked accounts on Polo and have Bitcoin on X account and Factom on Y account then trade with yourself and you'll figure out the technique. It is not possible to sell several percent of FCT per month for over a year in this fashion because you'd run out long ago and the last dump to 0.003 exposed just how much of the buy side was the MM and it was a lot.
I cannot prove this it is just a market theory like yours but the only thing that matters is that I think so and with that in mind I need a much larger margin of safety than currently hence why I am not buying here.