[comdpa]

In 7-13 Mr.Kelley talks about shoulder turn and downstroke shoulder lag. "Keep that right shoulder "back" but also "down" (on plane)"
Does this mean the right shoulder would have a dragging, passive feel through impact? Accomplished how? I had always thought of driving the right shoulder to the ball. BTW I'm a swinger.

Yes stilltrying,

Please take a look at 10-13-D and the accompanying pictures. This is what the right shoulder should be doing on the downstroke.

Anything other than "back" and "down" will mean that you are "roundhousing" per 2-N-0 and "run out of right arm" per 7-13 and have no follow through per 8-11 and 6-H-C.

What do we mean by "back" and "down"?

They have to do with Plane Angle and Attack Angle, because per 7-13, "When the Shoulder moves on the same Downstroke Plane as the Hands, it provides its greatest support and its best guidance to the stroke."

Please see 2-C-0 in this respect: "Your main lines of defense are the Flat Left Wrist, Hinge Action...and a Three Dimensional Downstroke - that is, DOWNward (Attack Angle), AND OUTward (Plane Angle) AND FORward (Approach Angle)..."

Referencing 10-13-D #3, which is a down the line perspective, the right shoulder stays "back" and did not roundhouse over the plane line.

From a face on perspective per the pictures from 8-7 to 8-11, the right shoulder works down and then below the left shoulder, not stay level with or go higher than the left shoulder.