The 'Gox whale' is a Japanese court. The court currently has no reason to sell anything and no legal right either. All debts are now covered and payable. It'll be several months before we know what happens to the rest of the coins.
https://news.bitcoin.com/the-mt-gox-whale-explains-his-crypto-selling-strategy/
https://www.coindesk.com/mt-gox-trustee-sells-400-million-bitcoin-bitcoin-cash/
I want to add that according to my understanding from this links ( The court is not controlling the coins but they kinda act as consulting party until he payback all the debt ) .
But isn't paying back all the debt will make him free to do whatever he wants with the remaining coins ! .