It may be worth noting that I am not Richard Kennaway and am not necessarily arguing for the same position as he is.

Nevertheless, I agree with all of what you just said. To it I would add that Jiro is still unconsciously assuming (I say unconsciously, because everything he is saying presupposes it, yet he never says it) that laws and punishment are all about adding up the good and the bad and seeing how the sum comes out. This is the very theory that Lewis was arguing against.