[YodasLuke]

ok luke so your saying from this article that some teachers study the way top players swing and teach these movements and that is wrong. i also guessing that alot of these players where probably studied hitting a driver these same players when hitting a wedge probably dont move there head much at all.

I'm simply stating that the data given in the comparison are wrong. There are other factors here that lead to illusion. There is a hole at the base of the skull where the spinal cord enters called the foramen magnum. The skull is oblong (not a perfect circle) and this hole is located BEHIND an ear to ear diameter. Additionally, the bones furthest forward in the skull are the front teeth. The nose is cartilage that protrudes even farther from the center of the head. Therefore, rotation around the spine, a single axis would cause the nose, as a point of reference, to move dramatically. The Stationary Post (a players head) may turn (Pivot) but does not "sway" or "bob". And, this relationship does not look like a lollipop on a stick. The spine is not centered in the base of the skull. Rotation creates 'movement' if looking at the face. This is the lesser of the details.
The second is the ability for the head of the humerus (the top of the upper arm bone) to protract (to extend forward or the feeling of making your shoulders touch in front of your sternum). The shoulder is also on a concentric circle with the head or spine as the axis, which would be measurably further than the nose or face from the center of rotation. A common myth in golf instruction is that the shoulders turn as if they are a steel bar across the spine. It is NOT the case. Simply measuring an angle created by the movement (turning) of the left shoulder includes no portion for range of motion (protraction) created through extensor action. Seemingly, this angle would be created by turning the shoulders as much as possible with some 'head' movement ("sway"). WRONG! You lose double Jeapordy! Without the above mentioned considerations the article referenced earlier would seem to have merit. When my left shoulder is under my chin, my right shoulder is still very visible from a front view. This means a different degree of "turn" is happening in each shoulder.
Yoda's been very busy with people coming in from out of town, and without his help, I would have never seen these things. When he has time, he will post the DEFINITIVE post on 9-1-5. I'm anxious to see it.