sources say, the Goxers from Japan took a huge cut when they
offered some "London Whale" types to shut down trading, exactly when it suited them.
credible?
Whether it happened or not, it would be inconceivable that such a conjecture would not pop up and make it's way around. Along with all manner of others.
Certainly such a thing strikes me as worthy of 'hypotheisis' status. Going forward we just see how future facts stack up against this and other hypotheses which remain viable.
edit: fix statement slightly.