flat vs steep BS shoulder turn?

[gmbtempe]

Keep in mind that Rotated can locate a TSP Angle

What "locates" the TSP, is it the hands, the tip of the right shoulder?

zero shift require a corresponding high Elbow Plane

So one locates the TSP off the rotated shoulder plane, zero shifts, how can they get down to a plane lower than the TSP at impact without shifting? Trouble visualizing this.

Match your TSP to your desired impact Plane Angle rather than vice versa

What is the procedure for this, again it makes sense but I just take the club to the top and turn, how does one complete a desired TSP to impact?

Or in the case of a shift down to a lower plane for impact, require a more minimal shift to get to that Elbow Plane. Minimal being better theoretically speaking despite the big shifting Jim Furyks of the world.

Does this mean if you are going to use an elbow plane impact ideally you are as close to a elbow plane backswing, flatter that is, like Hogan?

Thanks just trying to understand. I swing flat back and under the plane on the downswing so I am constantly in search of something to fix this.