It's not a secret Satoshi Nakamoto has more than 1 million of Bitcoins in his wallet, right?
If he suddenly wants to sell all his Bitcoins, could it cause a chaos in Bitcoin market making the price fall? Or is this amount too insignificant to cause any mess?
Any large holder of bitcoin can make the market go into chaos by doing something like that. However, they don't stand to benefit from that because they wouldn't be able to sell anywhere near 1 million btc before the price was far, far below the current price. It doesn't take a lot of money to manipulate the bitcoin market, so people who are holding large amounts don't have a good way of exiting their position without harming the market and reducing the value of the majority of their holdings.