Can you prove an average sword can do that, first off. Second off, it's not the sword itself that matters, so much as the speed and reaction times and the ease and nonchalant'ness that he did it. Jack's problem is that while he is incredibly fast when he moves and is very rescourceful, hsi actual technique isn't very good, and it's predictable. Kenshin... well... Kenshin is the most overrated person here. He's actually the most ovverrated samurai ever, really.