[rwh]

The difference between #1&#6....is very little,and from #2 to#5-how far away are the trees?,how close is the camera?

There is a horizontal grass line in the background. Compare photos #1 and #6 and see how much his head has dropped. It's dropped even more in the Follow-through (#7).

Draw a vertical line down from his left ear . The left ear is quite a bit farther from the inside left heel in #6 as compared to #1 and and even more so in #7.

From this I conclude that his head is moving down and back from the Top into Impact and continues to move down and back even more from Impact to Follow-through.

If you all agree that this full swing (pages 124-125) represents a Head Pivot Center, that's fine. I just see a ton of head movement there.