[O.B.Left]

It's not you Ob.

But concerning Hinge Action, for simplicity;

For a Swinger, Hinge Action should be viewed as Zone 3.

For Hitting, Hinge Action should be viewed as Zone 2.

Can you point me to the section in the book where this is discussed?

There is no doubt that the Hinge Action is a product of the physics associated with the stroke being used, the elbow position, the Throw etc but Clubface Control is ideally left to the Pressure Points in the Hands, no?