I also cannot label Sergio's downswing action imperfect if he successfully gets his clubshaft-on-plane at the critical time point - at impact.
You've just found the definition of "on plane". To expand a bit, it's when the right forearm and clubshaft are tracing the plane line. Prior to that, just about anything goes.
Mathew put up a nice 3D animation at one point. Pretty sure its still in the gallery.
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1-H "Because of questions of all kinds, reams of additional detail must be made available - but separately, and probably endlessly." Homer Kelly
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