[Mike O]

In a left arm swing, the right arm push.
In a right arm swing, the right arm Swings around the right elbow and the left swing along with it, and flat left wrist is no longer an imperative...

----------------------------
So....

Anything which allow CF throwout is swinging or works like a sling. Allow the assembly to work like a Flail. True swinger.

And another side of the extreme , true hitter. Muscular drive out. True hitter.


Then there is somewhere in between. This is where its a little Grey...

IMPO. As long as the right, forearm supports the secondary assembly , CF throwout in the picture, left arm have 2 hinges and pulled like a rope. if the forearm supports Primary assembly, there is no way to get CF throwout and the left arm becomes a brick wall as there is only one hinge.

and if this"passive" extensor action pulls the PP 1+3 , I believe the extensor action is more "active" than the extensor action just pulling via pp 3 ..

7-3 explains of such combination of extensor action. Merely on PP3 will have extreme " throwaway" . Thus with PP 1 + PP3 could be preferred on full swing ,

PP1 an PP3 pulling of extensor action, will have effect on how to setup the Flail. thus create different type of Slinging action. but both are swinging...
one look more softer and wristy with more "throw'. one look more powerful with more "drive". 7-3 right forearm have to be thrown or driven .

Nuke,
I always prefer a post that stays on one topic and limits it coverage area- tough to follow or respond for me- but that's just me maybe and not your post.

From the start your post throws me- "A left arm swing the right arm push"? Lost you there. No it doesn't have to push- for example I've seen one armed left hand golfers make golf swings. You could do the same thing and just have the right arm on for the ride. Beyond some other comments in your post, your first comment is just confusing for me.

Also, just because the right tricep is one of the muscles straightening the right arm doesn't mean that you have a hitting motion nor would it mean that it is a right arm stroke- i.e. right elbow center of stroke. I've been fly casting with Bucket (well not really but I wanted to include him in my post- poor guy has no friends!) and I used just my right hand and arm to swing it out there- I've also taken a wet towel with my right hand and arm and smacked some ...... never-mind that's another "swinging" story.

But before we get off topic too far- I identified in the book a section or two that supported my answer that "Pure" or "True" meant a reliance on the acceleration method to align the clubface. You stated a different answer for what "True" is in Golfing Machine Terminology- so please back that up with your references.

Thanks