Anyway, fuck that.. if 20K BTC is all Roger BUr has got, there's not much more to see here. Let's Move on as usual.
If we assume he has a large hand in the Dash pump, I think it's also safe to say he can get his hands on an awful lot of that knackered old BTC if he's a little short right now.
Yes. I am sure he may have a pretty large stash in ALTCOINS, worth maybe those hundred of thousands of BTC mentioned in the past, maybe he even doubled its value during the last pump of dash, but... He would need to dump those altcoins (crashing them) and rebuy BTC (pumping it) before being able to dump. Zero sum game.
He could short BTC with FIAT/ALTCOINS but.... leveraged positions are the worst place to be before a hardfork.