[tongzilla]

The "On Plane" Downstroke Shoulder Turn was recommended by Homer per Basic Patterns 12-1 and 12-2. Look at the photo in 10-13-D #3. The arrow is trying to show that the Right Shoulder is On Plane even to the End of Follow Through. Note that I'm assuming if the Shoulder is On Plane at the Top (10-13-D #2) and also On Plane at Follow Through (10-13-D #3), then it must be On Plane in between these two Sections also.

I know it also says "when the Shoulder can't quite reach the Plane, it is better to use a steeper Plane". I'm trying to say that almost everyone uses a steeper Plane after studying many photos of pros (I excluded anyone using a Double Shift since they will be using the Elbow Plane, so the Right Shoulder will obviously not be On Plane).