A liquidator cannot buy BTC since his job is to pay all fiat debts. BTC isn't a currency in many countries.
So a BTC debt possibly has a lower (or zero) priority when liquidating.
Owning a BTC in Gox would be like having bought a product and payed upfront, you simply will never receive the product or your money.
Excluding BTC debt Gox is still solvent, they just need to close their USD 30M short. Why is the liquidator even involved? None of this makes any sense.