Lynn's video is very good at describing the rhythm and the hinge action in chipping. I like the analogy of the merry-go-round. In the chipping the slowest RPM would be the left shoulder and fast RPM would be the clubhead.
I believe the full swing is a different animal.
The full swing requires a good pivot, the torso has the slowest RPM, slower than the left shoulder, and thus should be the regulator of the total speed(tempo) of the swing. Just like the drummer of a band dictates the speed of play the other band members.
I believe the initiation of the swing, would be better of at the core perhaps the pelvis turn, maybe the shoulder blades and rotation of shoulders , or the head turn. This would keep the swing motion in rhythm.
Don't confuse RPM with MPH. RPM (Revolutions per Minute) deals with the act of revolving (orbit) and the time it takes to complete this action. MPH (miles per hour) is pace. The Clubhead and Left Shoulder can move at the same RPM's, but the Clubhead has more MPH's. The Hips move through Impact at approximately two MPH, the Shoulders five MPH, the Hands 15 MPH and the Clubhead 100 MPH, but all can move at the same RPM's.
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