I think that both can be done. The biggest deal about S&T or the M**** stuff, is about the Biological relationships when an athletic move is being done. The head must remain as still as possible.
That raises the question what type of movements must be done to do it.
I don’t debate on were or what really is the center of the swing. The reality is what is going to keep the head still (or as still as possible)
Another situation about the spine on this model is that your spine is not fixed or is it staying in the tilt as it would seem. You’re trying to change the relationships of the lumbar, thoracic and cervical spine through out the swing to keep the head there.
The neutral spine, or fixed spine is NOT actually what is going on... as you say. Another thread that had input from Mr. Skywalker had quite a bit on information concerning this. The TORSO may appear fairly stationary(steady head, no bobbing, no swaying, etc.), but other things are going on under the torso to keep these things that way.
Again... what about the different Shoulder Turns and Hip Slant relationships and combinations? For example... Rotated Shoulder Turn with Standard Knee Action, and other combinations that can work well together, and some that may be difficult.
Yep.
They change due to ball placments and baseline changes. Which should be set when the computer is ready. So may develop a shift of the spine. Some do not.
The key to playing them is finding yours and stick with it.