[whip]

Yes, correct angle of approach uses closed stance line, ...that is why I deleted that sentence. Maybe it is not the overall length that is the important factor but rather the live tension that is more easily noticed with a restriction to a motion (which would be conducive to shorter overall swing radius), such is the case with flat left foot action, right anchor and delayed hip action. I think the key is that in 10-15-b he says "tighten the left side tension and set the stage perfectly for the hips to initiate the downstroke shoulder acceleration." Which is a very crucial moment and concept when swinging. 10-19-c drag loading wants you to launch the right shoulder down plane via the hips, and as homer states delayed hip action can set the stage perfectly for this.