Yes, Rocks 'n Shoals method is different from Dick O'Kane because he is depending on entering the correct range. He is also running the attack with a stopped submarine, a big no-no on my list as a real submarine could not maintain depth control at full stop. I like to be as realistic in my behavior as possible. Yes, you're right that his entering an accurate range makes relative angles of target track and own course irrelevant.
But his is a constant bearing technique of setting the torpedo path and timing the shot for the target to cross the periscope sights. He does a very good job of explaining and illustrating his procedure step by step.
It shares the limitations of using the chart in that if you are forced to shoot at any bearing but the one you have chosen you are out of luck. Since constant bearing attacks are an ambush technique, that won't be a problem very much of the time.
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