Dont worry over such things, as your worrying can do nothing to affect the outcome, as Jetstech commented it would not be in the interest of that account holder to tank the prices by selling all at once, as was the case with the MT Gox lawyer. If I owned 1 million bit coins I would want to get the best price possible on all 1 million of my coins.

Besides the owner of the Satoshi wallet is most probably AI