by you that i have read- not so technical
"In an ideal Bertholy model swing the first move of the downswing will be the movement of the lead knee towards the target. After that movement the hands drop lower. After these two things happen the shoulders rotate in the downswing. What is observed is the movement of the lead knee initiates/causes a rotation/shift of the hips and that happens while the hands are dropping and before the shoulders rotate".
Let's see how you do with the back swing.
Peter, the motion photo of Mike Weir you posted
earlier, can you post that again with a motion
photo of Hogan next to it for a comparison?
JC