So okay, this is just a estimation, so in case Bitcoin price rise enough, he could not be a labeled as the wealthiest man on Earth. Beside him, who is the biggest bitcoins possessor ? Roger Ver with 300 000BTC ?

I just passed on a thread where people were discussing whether Satoshi had sold his coins or not. But my question is how do you know that he actually have coins ? It is rumored that he would have one million and a half coins, but yet, the biggest address has way less than this, so can you know that he has a given number of coins ?