MtGOX didint happen quick or in seconds. It was process that was visible to most of BTC users who cared enough to inform themselves. We had enough time to pull away from there, which many of us did. Many who didint gambled that they will survive and that they will earm a lot of money from buying underprices BTC that was sold on MTGox far under the real price.
So all i can say it's just another conspiracy theory.
to clarify
when mtgox prices went down below the other exchanges.. no one could arbitrage it because mtgox locked withdrawals.
thats why the price went down. what happened was people recognised mtgox was failing and stopped 'sheepfollowing' mtgox.. thus while mtgox dropped to $100 other exchanges remained at $250~
anyone playing with the $100 mtgoxcoin was playing with vapour. those doing it knew it, but still had hope if they can game it by doubling their mtgoxcoin. they could hopefully have a vapour balance larger that the lockin and hope to recover something at a later date if mtgox reopened later or was taken to insolvency court.
they knew thy couldnt just withdraw, but thought if they could double their balance it could possibly mean double the pennies on the dollar return at any debt recovery plan later.
as for the OP's conspiracy.. sorry, that just does not play out