[Yoda]

I didn't mean the full fireworks e.g. spinning the flywheel and Right Shoulder Drive to Load PP#4, etc...

I meant using just a little Pivot to give that Left Arm a little mini blast off, as opposed to using your left arm muscles to move to left arm (ala Ben Doyle...that's a discussion for another day )

The Right Shoulder Turn Thrust drives the Left Arm in a Pivot Stroke. And the Shoulders are a Dual Agent (2-H, 7-13), i.e., they are part of both the Power Package and the Pivot. So, Shoulder Motion (and Action) does not violate the requirements for Zero Pivot.

However...

In addition to Zero Pivot, the Basic Motion of 12-5-1 specifies that the Shoulder Turn also be Zero. Remember, this is a tiny shot. As I've previously stated, everybody wants to make this motion bigger than it is. Per 6-B-4-0 and 10-3-D, the Left Arm motion can be independent of the Pivot.

Point of information: In the as-yet-unpublished 7th edition, Homer Kelley changed the Zero Pivot requirement of 12-5-2 to Minimal Pivot. In addition to the already permitted Downstroke Shoulder Turn, this expansion satisfies the need for the Swinger's essentially inert Left Arm to pick up a little Body Momentum Transfer from a 'thrown' Right Shoulder via the Hip Action of 7-15. In addition, it also satisfies more than a little 'psychological need.'

Bottom line: I'm all for the Swinger's 'mini-blast-off' in 12-5-2 (Acquired Motion) and the major-blastoff of 12-5-3 (Total Motion), but...

In the Basic Motion of 12-5-1...

Nada.

The Left Arm is on its own.

Which, of course, is why Hitting -- Right Elbow Drive -- is so attractive in the Short Strokes.