No, he plans to buy back around 400-600, thereby halving his money. He will do this repeatedly in order to get rid of all his money and avoid suspicion.
edit: I have no idea about this. There are too many reasons why this human could be doing this.
It´s no human. It´s a bank, goverment o corporation group.
Link?
Link? Do you think all the people have 20 millons usd to play with bitcoin and lose millons selling low only to manipulate the price? This is a group, bank, goverment or walls street.
I think you are being rather short-sighted -- there are planty of billionaires out there, who made their money doing allsorts of things other than BTC trading. As someone mentioned earlier, most IT start-up buyouts by Facebook, Google, Microsoft etc are for money in excess of the entire BTC market capitalisation. And in many cases they are nonsense fads.
So, the idea of an individual manipulating the market is perfectly feasible, and probably more likely than some sort of conspiracy to "kill BTC". As I posted earlier, this could have been done quite easily 5 hours ago with a market order a fraction of the initial wall, causing a panic and crash to single figures.