The palm of the Left Hand does not lie in the plane of the Left Arm when the Left Wrist is Flat (upper Left Arm in line with the back of the Left Hand). Because of the heel of the Hand, it is sloped away from it (counterclockwise) and appears 'more vertical' at the Top (and In Line with the Plane of the Turned Right Shoulder). Thus, the Wrist can Cock on Plane without the Left Arm being On Plane.
Maybe what you are considering the Vertical Wristcock Motion of a Flat Left Wrist is really the Vertical Wristcock of an Arched Left Wrist (which puts the palm in line with the lower part of the Left Forearm and therefore not On Plane with the Right Shoulder).
The cocked "Flat" left wrist appears slightly bent...Preach on Preacher....That is Alignment G.O.L.F. versus Dogmatice G.O.L.F.
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