[mb6606]

You misunderstand extensor action- it moves nothing. It does not move the left arm just tugs it, stretches it like a stubborn tight bungee cord that needs constant attention to remain pulled.
That is not adding. Adding is removing rhythm by forcing more hand into the stroke near impact.
Ben says no “adding.” Yoda says “no try just do.”

That implies that the right arm does little. Pivot alone? I have to tell the right hand to extend the arm.
Watching Homer the right arm goes from an "L" position to a straight one past impact. How can Homer not be adding???

Seems to be a difference of opinion between BD, Yoda, BM and CE? Do I need to ask Homer?