Yoda - you wrote-: "All he asked was that golfers understand the necessity of a fixed point at the top of the Pivot (Pivot Center / The Glossary). He recommended the Head but did not mandate it (2-H). In fact, he offered an alternative, i.e., the "point between the shoulders" (Stationary Head / The Glossary)."
I think that the upper swing center is a better reference point for the idea of a fixed point at the top of the pivot. I think that the upper swing center usually remains more stationary than the head in a good golfer.
I don't need to draw lines on those photos for forum members to mentally picture the location of the upper swing center. It is defined as a point midway between the shoulders - which is roughly a point within the chest cavity a few inches in front of T2 vertebra. That point is about 2-4mm (actual amount dependent on computer screen resolution) south-east of the C7 blue dot in those photos. A vertical line drawn down from that "imaginary" point would hit the ground roughly in the center of their stance.
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