[Yoda]

In the video you pointed out, Lynn turns DTL and appears to cock and uncock on the inclined plane as opposed to the plane of the left wrist cock the left arm flying wedge...........does he not?

The Cocking and Uncocking of the Flat Left Wrist does indeed occur on the Inclined Plane. However, it remains a Perpendicular Motion (4-B-0/A/B/C) relative to itself.

Visualize a simple hammering action. The 'standard' motion is performed perpendicularly. However, it is often performed at an angle (on an incline, if you will). The same 'sideways' action occurs in the Golf Stroke.