This would only work if the coins were still there. If the Gox coins are stolen/lost, then what are you buying? A worhtless claim to coins that don't actually exist, and that you can't sell.
Who would deposit bitcoin in an exchange where the average price is a fifth of what is was in other exchanges? Fiat deposits wouldn't matter for this plan.
https://blockchain.info/zh-cn/address/1P3S1grZYmcqYDuaEDVDYo...
Whether they still control the private keys is different question.
More discussion and evidence here:
http://www.reddit.com/r/Bitcoin/comments/1z30q9/gox_has_at_l...