[Yoda]

And the pic has been altered, no?

No, Birdie, the photos in the Scott sequence were not "altered." They were rotated approximately one degree toward the horizontal in order to remove the sloped bias of the original tilted camera angle. All Stroke relationships were unchanged.

And the only reason I did that was to counter the absurd analysis of the aforementioned "competitor." The day after I posted the sequence here as an example of the Head-Centered Pivot, he chose to use the exact same sequence on his site as an argument against it. As "proof," he drew reference lines -- I had drawn none -- purportedly perpendicular to the horizontal plane, i.e., the ground. In fact, given the slope bias, those lines were not perpendicular, and when I exposed that error, his argument collapsed.

As it should have.