LOL
That too is possible. In my opinion is less likely because these kind of godzilla traders usually don't use margin. I can imagine they even manipulate the money-market (the swaps...). For example, remember how USD swap rates increased at the end of may? Sure people were going long, but the rate was sustained by big fat multi-million dollar swap bids... from august on instead the situation is the exact contrary, including big fat USD swap asks. Oh god, this is so fucking complex. aaaaah

EDIT: Watch this, it is fun