i suspect the reason he is holding BTC is because of the trading engine glitches causing people to get free coins. if everyone cashes out he can't rollback the trades and undo the damage. i imagine a lot of people transferred their funds out as soon as they realised what was happening so he might already be down.

then again i've seen no acknowledgement from him at all that there was any problem with the trading engine, so who knows... a bit of communication would go a long way here!