[yippedagain]

Yeah, I am sure there is more than one "System" that has its roots in the pics in Chapter 8 and 9.
Diane has moved in relation to the background from 9-1-6 to 9-1-7. Her Feet are a couple of inches further left in 9-1-7, which I guess makes it look like the Right Knee is kicking in more than it actually is.
Beach balls, sheep dogs and clubs across the the top of the Right Thigh going underneath the Left Thigh all help to let the Left side separate from the Right during Start Down.
I suspect though that it may be more effect than cause. The major cause of snake hips and Elvis knees is many have been told that it is good for their game. " You can't turn your Hips fast enough" " Git that Right Knee in there " etc.
" All Components, except the Right Foot and the Right Shoulder, have reached or passed, the Line of Sight to the Ball", I think could also encourage this.