I'm so use to people disagreeing that I automatically read it as you disagreeing with me, LOL.
I agree with your thoughts on one's interpretation ..... however when you take one's interpretation, explanation, demo in this case and apply it to their actual swing (like W=w did) for verification, then I believe there is something more to it. If you demoed AP's knob to the ball, like he did in that video, I would of dismissed it just like I first dismissed AP's demo.. makes no difference who did it. However if W=w posted the video that he posted in this thread and I revisited your demo, then I wouldn't be so quick to dismiss it. I actually see some of that movement in his swing. The fact that AP himself did the demo and explained his approach and now I can actually see some of that in his swing holds more water because it's actually coming from the horses mouth... maybe there's something to it,
I believe when incorporated with a complete swing it get's the hitter going in the right direction and on plane early, with the barrel arcing behind led by the knob. I just believe there is a little more linear movement with the knob and the barrel lagging behind at first. I don't believe in TTB from go and the body will react appropriately
Here is where things get a little fuzzy. Some people believe certain things... (and this was really my whole point in chiming in...)
The bold above is something that is often misinterpreted...