Interesting theory, but there is no implicit parity between # of winners and # of losers. Whereas 1 firm lost $440M there were thousands (maybe tens of thousands) of firms and individuals that made hundreds or thousands of dollars.
Unless someone comes in and scoops up Knight for cheap--the stock is trading down 65% or so over night.
They are out of cash apparently. Likely to be sold or file for bankruptcy shortly it seems.