[Yoda]

So are you're implying it could be in both Zones...Zone #2 the Arms Lane is what it does...moves around the pin....Zone #3 the Hands Lane are what it controls...the Clubface?

If you see Hinge Action -- the Rhythmic Roll of the #3 Power Accumulator (the Angle formed between the Left Arm and Clubshaft when the Club is gripped under the heel of the Left Hand) from Impact to the end of the Follow-Through (Both Arms Straight position) -- as being automatically induced by the Physics of Rotation (Hitting or Swinging), then you see it as a Zone #2 (Power) Component.

If, on the other hand, you see Hinge Action as the veneer control applied by the Flat Left Wrist to individualize that Motion -- independent of the Motion itself -- into the three distinct applications of Clubface Control (Close Only, Layback Only and Simultaneous Close and Layback), then you see it as a Zone #3 (Purpose) Component.

One not-so-minor problem: If you see Hinge Action as being purely a function of the Physics of Rotation, then what do you do with Vertical Hinge Action (and its Clubface Layback Only)? It is neither the natural byproduct of Hitting (with its Muscularly-Powered Angled Hinging -- Simultaneous Clubface Close and Layback) or Swinging (with its Centrifugally-Powered Horizontal Hinging -- Clubface Closing Only). It is always, then, regardless of Lag Loading procedure, a "deliberate mechanical manipulation" (6-B-3-0). And that can only be Zone #3.