[Loren]

If most tour players are double shifters then why is it that Lynn and Ted always have the TSP drawn in the amazing changes section?

And why in most photo are the hands, right forearm, sweetspot/clubshaft and right shoulder pretty much on it?

They must feel like that is a better downstroke plane, all the way to impact. And I guess they don't think shifting down to the elbow plane is worth while?

Is that the case?

Yes, that's correct.

The preferred plane angle is the turned shoulder plane, however it may be determined by the actual shoulder turn component. The reference point primarily means after a flat shoulder turn but other shoulder turns can be used for the reference point, and it says that if the former can't be reached then a steeper plane angle should be used.

"This plane angle has far better performance characteristics than any other because any plane angle shift is hazardous. This procedure does not refer to the disruptive shoulder turn takeaway."

And the plane angle variation (various shifting) specified is Zero Shift, which means both directions. (Mandatory right forearm takeaway.)

The Standard shoulder turn component is a Flat (as possible) backstroke turn and an on-plane downstroke turn.

It was changed in the 7th edition to Rotated Shoulder Turn (right angles to the spine) and we're discussing if that's possible given a Slide hip turn, because the shoulder turn seems to demand a Shiftless hip turn. The discussion really belongs in the Changes for 7th Edition thread.