this is where you are very wrong.
the Federated model SIDECHAINS allows a transformation of BTC to all manner of speculative assets by allowing an offramp to these speculative SC's with opaque ledgers and insecurity. this does 2 things; drains value from Bitcoin itself and increases attacks while on this insecure SC. this is a totally different situation from a gox general deposit address which still exists on the Bitcoin blockchain and even if hacked just moves those BTC to the hackers new address.
FTFY, again.
Sure what you describe is true, that is if you believe and trust gox to maintain full reserve. Unfortunately history has shown this to be a very shaky proposition