Turned Shoulder Plane Confusion

[nevermind]

Every now and then I get an urge to understand the practical use of the turned shoulder plane... but my egg has never fully hatched, just a few cracks here and there. So this time I want to follow thru to the end. Here is the last question I posted, I'll follow it with another.

these stickmen are great, big thanks to everyone involved

Now to the zero shift hitter down the line. Firstly, I'm assuming that the second frame is Impact Fix, I hope that is correct. I've always wondered what part(s) of the golfer or club had the zero shift. Watching the stickman I can see that it is the hands and the sweetspot that remain on the one plane angle. This also answers another question I had.. how it was possible to have the shaft and forearm inline and on the TSP angle at Fix/Impact, without having a straight rear arm. Looking at the stickman I see that the answer is, they aren't So now im confused. When zero shift hitting on the TSP, are the rear forearm/shaft mean to be inline at Fix/Impact?

I feel like I'm missing something that everyone else understands perfectly

So I finally have a copy of the yellow book (thanks Smithy ) and was hoping it would help clear this up for me. We'll, it did and it didn't.

Looking at the pics of 10-6-B and 10-13-B, showing a TSP angle with a Flat Backstroke Shoulder Turn, I can see how the rear forearm could be set inline at Fix/Impact with some elbow bend. But if you don’t stand that upright, allowing for an almost horizontal to the ground shoulder turn, I just can't see anyone having the inline shaft/forearm on their TSP without having an essentially straight rear arm That stance is more upright than you would advise isn't it?

So I come back to the same question as in my last post. In practice (more waist bend that the pics I've mentioned), when using the TSP angle, will the forearm/shaft form an 'almost inline' condition, as seen in the stickman above? For some reason my gut feeling is that in reality the hands would end up slightly below the TSP, allowing for the inline/on-plane rear forearm. A clip of Els shows this I think.

I should add, I'm not trying to use the TSP, just after greater understanding. By the babble above you can see I have a long way to go.