In what way do they have that capacity? That they let him and others clear trades (and made no policy against it) in the window between the trade and rollback,

In what way do they have that capacity? That they let him and others clear trades (and made no policy against it) in the window between the trade and rollback, and that their policy pretty much doesn't give them the power to do rollbacks, I don't see how that can fly. As far as I can see, the only real option that Mt. Gox is to let all the trades go through this time and then let the trades go through. It is the only way that Mt. Gox will avoid several million dollars (USD that is) of liability.