Chris,
I see your issue, I'm sure you've been praying for someone to understand your analysis.
The "left wrist on-plane" is a very general term- as I've seen it used. As you correctly determined- say at the top of a typical golf swing- a flat left wrist is certainly not on plane, if it is flat- then it's on the same plane as the left arm- which is not normally on plane- except with a zero #3 accumulator.
Could the left wrist be precisely on plane somewhere during the backstroke or downstroke- for example where the left arm is parallel to the ground on the backstroke or downstroke? - it could but I really wouldn't think it would be worth noting.
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