[ChrisNZ]

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.

Exactly, thanks for understanding Mike O! (Although I wasn't praying, that was just me cocking my left wrist up and down to try and figure this out!)

I guess I'm still a little unsure how the club can be on plane while one still has a flat left wrist though, unless the club leaves the left hand at an angle. That is, if you hold the club up in front of you in your left hand the club will need to angle towards your right. Hey, maybe that's why we turn the wrist?! The geometry of this is killing me!

Related question (I think) - is a perfectly sequenced release (on plane) impossible, because at the top the left wrist is not on plane. Do you need some simultaneous roll to ensure the wrist uncocking is on plane?

Actually this refers to the second part of your quote. Surely on the downstroke it is essential that the left wrist be on plane if you are purely uncocking in a sequenced release (so it would be worth noting). But then as I said, this may be impossible (pure uncocking).

Chris