Statements:
You don’t need to have the Right Forearm On-Plane at Impact, but having Your Right Forearm On-Plane at Impact offers support and the best geometry to insure a 3 dimensional impact.
1-L-20 For any given Line of Compression (through the ball) every Machine must produce identical Impact Alignments.
Inference: “Impact Fix” alignments vary per “Basic Plane Angles” 10-6-0
Question: How does “Address Posture” (down the Line) differ for Golfers using an “Elbow” Plane Vs. Golfers Using a “Turned Shoulder” Plane?
Are the above statements and inference logically connected?
Does Axis Tilt play a role?
Do Golfers using a Turned Shoulder Plane have Shoulders more Open at Impact than if using an Elbow PLane?
Is the Right Forearm closer to Parallel to the Base Line of the Inclined Plane when using a Turned Shoulder Plane than an Elbow Plane?
This could be a good learning opportunity for newbees. But, you need to understand something about HK and the Book. This is something said in a round about way. In Hands controlled Pivot Swings (the mind is in the Hands, etc.) the Hands dictate to the Pivot. This means that Hand location and an On-Plane Right Forearm at Impact determine where the Right Shoulder needs to be located if you want it's support. In other words, if you want the Right Shoulder to help support the Power Package than the Right Shoulder must comply with the Inclined Plane. In a Turned Shoulder Plane, It's not your Hands that need to comply with the Right Shoulder by being on the Plane (the line from Ball through the Right Shoulder) but it's the Right Shoulder that must be on the line from the Hands to the Ball. The Naming of Plane Angles by referrence points, such as "Square Shoulder", "Elbow", "Turned Shoulder" only Identify (by Drawing a line from Hands to Ball) where the Right Elbow needs to be at Impact.
That is why ANY return to the Elbow Plane is Pivot Controlled Hands.