I took this away as a tl;dr
Currency: BTC Balance: 951,116.21905382 <– That fat fuck has been lying!! Currency: BTC Balance: 951,116.21905382 <– That fat fuck has been lying!!If they had the public keys to all Mt Gox's wallets whey would be able to check them for funds, but there would still be questions about who controlled the wallets and if they had found them all so it would still not be proof of fraud (but the more evidence collected the more likely there will be something confirm-able discovered)
There has been talk of a Wally trading program which is said to have be run by Mt. Gox to profit from the price imbalances. If this is true then the 200k might be Wally's account. Which would explain why Mt. Gox does not consider it real liabilities.