Basic Motion is a Learning procedure but not a G.O.L.F. Swing.
It teaches:
Impact Fix Wedge Alignment
Centered Hands at Address
Extensor Action Take-Away to re-set the Wedges
Wedge Alignment at 90 degrees for Impact
The Right Forearm On-Plane Motion at Release Controls the Left Arm Wedge Roll Rotation
Clubhead Overtaking and Left Wrist Swivel before-during-and after Impact.
On-Plane Right Forearm Flying Wedge
Low-Point Impact
Pulley: Clubhead Acceleration (The last phase of the Downstroke Acceleration Sequence)
Left Wrist Level Impact
Etc.
Its purpose is not intended to teach Hinging. In fact, its purpose is to teach all of the above, and more, without Aligning the Hinge Pin in your Left Shoulder to any associated Plane. The Left Shoulder, when performing Basic Motion, is a Ball socket and not a Hinge. Eventually, it will Show you that all Impact Alignments (regarding any Hinge Action) are identical except for the Right Elbow Location. In other words, and this is very important, it will teach you that Clubhead movement and Clubface Motion are separate and independently controllable.
You do not want Hinging to interfere with learning the above. You'll learn that Zero Accumulator #3 prevents the Right Elbow Location from participating to produce a hinge. Its important to learn that so when you Begin to Hinge (in other swings), you'll become aware of how the Right Elbow Location influences Hinge Action. If you learn this, then when you add Accumulator #3, you'll begin to Hinge through Impact. So, step one is to learn the motion of the Right Forearm through Impact (Basic Motion). Step two is to add an associated Plane Clubface Alignment.
Basic Motion is Zone 3 Training. Absolutely no Shoulder Motion is allowed, except after Impact. This isolates Power Package Alignments and Force.
TIP: When you use Extensor Action for your Take-away, your Hands will Only move Aft a couple of Inches. They would never pass your right pocket. But during the downstroke, you'll become acutely aware of the great distance your right forearm must move to reach your Impact Alignments.
What role does item #20 "Hand Motion - Hinging" play in your equation of Basic Motion without Hinging?
Basic Motion does not use "Wrist Motion". We don't Cock the Left Wrist during Basic Motion. We use "Hand Motion" to Turn and Roll.
Hinging is Clubface "Motion Alignment" through the Impact Interval. It's the difference in Clubface orientation from "Impact" to "Separation". Layback Only, Close and Layback, Close Only.
Since there is no longer a Hinge at the Left Shoulder (zero #3 Acc.), Clubface Motion through Impact mirrors our "Hand Motion".
Thus - "Hand Motion - Hinging"
"Hand Motion", All Clubface Motion Alignment will be like "Angled Hinging". Accumulator #3 is needed for Horizontal and Vertical Hinging.