It's looking like that 64 BTC loss was this player's last bet. They've already withdrawn hundreds of BTC of profit over the last few weeks. Maybe they have the discipline required to quit while they're ahead!
Good for them - some people have a lot of luck (at least more than me). That's why I love being the house - don't need to rely on luck maths will help you out. Anyways, I'm not so sure, from what I've seen whales seem to be degenerate gamblers who eentually give some/most of it back before quitting.
By the way, doog just out of curiosity how much do you keep in the hot wallet? Do you have a dead man switch in case something happens to you and Deb?