[Daryl]

So... If you plane shift, but keep the clubshaft plane angle constant, you can use any release that your pivot can support. So the club will travel on parallel planes. Is that what you're saying?

You say that plane shifters depend on a fixed release point. And I assume you will say that plane shifters play with pivot controlled hands. Is that right?

What are the mechanical requirements to hands controlled pivot and why is it only a single plane that meet those.

No. Let me help shift your understanding into high gear. This is going to cause a big bump in your TGM knowledge, so hang on to something.

First Concept: The Downstroke Hand Path of a Plane Shifter, is first Downward and then Outward (normal). His Left Arm remains nearly Adjacent to his Chest as it moves from high on his Chest at the Top of his Backstroke, to low on his chest (almost waste High) before his Left Arm moves away from his Chest.

When the Left Arm moves away from his chest, Release Occurs, and your Release Point will be at your Right Hip because that's where your Right Elbow is located when your Left Arm is against the chest and your Hands are Low. Anytime the Pivot controls the Hand Path Direction from the Top of the Swing, the Right Elbow will ALWAYS be Driven to this Location because the Left Arm Slides Down along the Chest.

Let me sum that up to make things perfectly clear... As the Left Arm moves Down the Chest, it will ALWAYS locate the Right Elbow at the Right Hip before Release. ALL PLANE SHIFTERS drop, lower or move or Drive the Left Arm Down the Chest during the Downswing. Otherwise, they wouldn't be Plane-Shifters anymore.

Second Concept: The most critical dimension in Golf Stroke Geometry, is the distance/measurement between the Right Elbow and the Ball at the time of Contact and Ball Separation. The Right Forearm Flying Wedge and Club Length and Plane Angle makes it so. If you place a Yardstick on the Planeline, the distance from Right Elbow to the Ball may be 12 inches for a Driver. Unfortunately for Plane Shifters, when using a 9 iron, that distance increases to 16 inches because of the shorter Club and Steeper Plane along with Right Elbow being Located at your Right Hip. Hence, Plane Shifters need to play the ball back 4 inches behind the Driver location when using a 9 iron. Or, the Plane Shifter can narrow his Stance, thus moving his Release Point closer to the Ball. One way or another, the Plane shifter needs to control the distance between his Right Hip and Ball at Impact for every Club because his Release Point is Always the same.

In Hands Controlled Pivot Swings, it doesn't work that way. The Hands don't follow a Downward Path - then Outward Path. The Left Arm doesn't drop Down the chest and then move away from the chest. The Hands Simply Trace the Planeline. At what location the Left Arm starts moving away, is determined by your Stance, Plane line and Target Line configuration and Plane Angle or, you're decision to use a "SWEEP", "RANDOM" or "SNAP" Release. ONE Ball Location and adjust your Stance for Balance.

Can golfers who swing on the elbow plane have hands controlled pivot? Hands plane? Turning shoulder plane?

Yes, as long as they don't shift Planes.

What kind of pivot control would it take to play hands controlled with plane shift?

You would first need to break the Laws of Physics. Then grow three arms. I think it can work with 3 arms.