#3 Power Accumulator
Not really understand this for sure, but what is this really? The roll of left arm/hand/club from p4 to p7, or is it the angle between left arm and clubshaft (which I find the same as #2 PA in practical terms)?
It's a "power" contributor (accumulator) yes, but any other benefit/consequence of mainly relying and making the most out of this in a swing?