Here is where my fog is: (not saying I'm right,etc but better than saying "I think" or "in my opinion" every sentence).
From dictionary.com:
weight: Physics. the force that gravitation exerts upon a body, equal to the mass of the body times the local acceleration of gravity.
So in physics weight is force, or pressure that can be sensed.
Kelley does describe club head lag pressure as a careful nursing of clubhead feel. The main thing that comes from lag pressure is the ability to feel the club head. I'm not sure how to reconcile club head lag pressure (strict definition) with the force that gravitation exerts upon the clubhead (at top).
Regardless, both "situations" produce force which the hands most certainly can feel. The hands now have club head feel. Then they do what is needed not to lose the sensed pressure (clubhead lag pressure is "always loading" - feel the wet mop head through impact). Including telling the body to make the necessary movements not to lose club head feel.
No- this is not a "swing the clubhead- feel the clubhead golf swing." You do not hit the ball with the clubhead- you hit the ball with your Hands- the pressure points in your Hands. Clubhead LAG Pressure is in the hands. Clubhead lag Pressure is not in the clubhead, either. And no- its weight unless change resistant- is neither Lag or Lag pressure.
I have tried to explain TGM concepts that are Hands Controlled Pivot but you only want the Swing the Clubhead/dance with the club type of stroke. The pivot works as trained- independently, intuitively, instinctively, and automatically. Trained, trusted and ignored by the Hands.
If you watch the last third of the clip, you will see Lynn Blake demonstrated the Start Down Waggle as he explains the start down sequence- Hip slide- Instant Acceleration and no self moving Hands (at that point of the stroke). You will see how the pivot sets the hands On Plane- not off, how the hip turn, sets up the right shoulder and right arm On Plane- not off.
But you will see pivot control hands because you want a Hands that Slave a Pivot. Nagging Hands. You feel better with a Hands in motion and let the body turn when needed.
This is how a 12-1-0 or 12-2-0 Golfing Machine G.O.L.F. Stroke works with well Educated Hands controlling the stroke and pivot.