Perhaps, do you have data on the trading volumes? I think it is unlikely that most were sold, if say the trading data would show that less than ten times of what they hold was traded in the last month leading up to the crash, I would say it is very unlikely that they sold more than half their holdings, so what would that be 50 million bitcoins, or 2 million per day, unless of course they sold them in back room deals to some bankster. But then of course situation would be worse...