Nothing is impossible especially if Satoshi is more than one person, and by this question, you said moves "his" coin. Meaning that he is not stealing anybody's money, so it is not a big deal, he has the right. Like any other BTC that is being moved in and out of the market, it will be judged by the size, yet because Satoshi is involved, the impact might be more regardless of the amount moved out. The impact on the market depends on the amount of money we are talking about. But I fear that this will not expose his/their identities.