O.K. so I got out the book and tried looking up the terms. Let me see if I got this right.
Side bend is a product of maintaining the right knee impact fix position, maintaining a steady head so the shoulders are rotating around a fixed axis, and starting the downswing with a hip shift/turn which tilts the spine.
This allows the right shoulder to turn on plane. Without the hip turn the right shoulder would turn over the delivery line not down it and cause throw out.
Is that close?
Steve