"But it is always a Left Arm Stroke unless the Right Elbow replaces the Left Shoulder as the center of the Clubhead Arc. (10-3-K)"
Simply translated that means when you bend your left arm the clubhead arc will be around your right elbow and not your left shoulder. As long as swing with a straight left arm the clubhead arc will be around your left shoulder and hence a left arm stroke.
You're putting up a lot of good stuff, David. Welcome aboard!
On this one, though, we don't quite see eye-to-eye. Bending the Left Arm does not negate a Left Arm Stroke and cause its Center to be transferred to the Right Elbow. Instead, a bending Left Arm most likely means a Left Arm Stroke that has inadvertantly lost its Maximum Swing Radius. The solution to that problem is the Extensor Action (6-B-1-D) and the precision Left Shoulder-to-Ball Address Routine of 2-J-1.
The Right Elbow Center is just what it says. Namely, you Hit (or Swing per the last paragraph) from the Elbow itself. It is a Stiff-Wristed "Batting" Motion with the Right Arm Driving the Club and with the Elbow serving as the Center of the Motion.
The Minor Basic Stroke that employs this Transferred Center is The Bat (10-3-K). With its Right Arm Drive, Rigid Right Wrist and Angled Club Extension, the usually mandatory Flat Left Wrist is now helpful but not essential. Hence, a tip-off to its use is the ability to hit hard with a slightly Bent Left Wrist at Impact and even to throw the Club in-line with the Right Arm during the Follow-through.
Also, per my post above, using The Bat with loosened Wrists per 7-19 and with Longitudinal Acceleration (the Club being Pulled from the Top lengthwise by the Right Arm) per 7-19-3, will produce the Right Arm Swing with its Center at the Right Elbow.
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