[Yoda]

Yes Jerry, the left hip slides parallel to the
target line while hips are still turned. This
sets the right shoulder on plane provided the
hands stay put.

Right you are, Donn.

In the Backstroke, the Right Shoulder Turns 'Flat Back' toward the Inclined Plane. At the Top (Hands Shoulder High), it joins the Hands On Plane. From there, even at the End (Hands beyond Right Shoulder High), it initates their On Plane Acceleration toward the Ball.

But . . .

The Shoulder is servant to the Hip Turn, and the Hands are servant to the Shoulder.

At Start-Down, the Right Hip must 'clear' -- left and inwards as the Shoulder stays back -- and thus pull the Lagging Shoulder Downplane. Only then can the Shoulder direct the Hands and their straight-line Lag Pressure Thrust towards the Ball.

This is the stumbling block few surmount. Almost always, the Right Shoulder turns off (above) the Plane, taking the Hands with it and condemning the golfer to a steep, 'above Plane' Impact and its stifling of the Right Arm drive. Hence the high handicaps that dominate amateur golf.

As always, Educated Hands (and their intent to direct Lag Pressure Thrust toward the Baseline and Ball) are the key.