[12 piece bucket]

KOC

I have no problem appreciating the fact that camera angle variations can distort our perception of whether the clubshaft is on plane - using HK's definition (peripheral end of the club pointing at the baseline of the inclined plane).

However, I can tell from looking at Sergio Garcia's clubshaft-hand movements in images 1,2, 3 that he is definitely not "on plane" per HK's definition (even when accepting the potential presence of camera angle perceptual problems), and the reason relates to the fact that Sergio has the individual idiosyncrasy of dropping his hands groundwards a large amount per unit time, with only a small degree of left arm rotation per unit time, during that time period of his downswing. I also cannot label Sergio's downswing action imperfect if he successfully gets his clubshaft-on-plane at the critical time point - at impact.
Jeff.

YES SIR! Sergio and Furyk are considered two of the best ball strikers on tour. They shift the club all over the place . . . I would say the plane matters most from impact to separation. That is why the #3 accumulator angle is sooooooooo important. You can shift the plane all over but as Homer said "Plane shifts are hazardous" . . . I would add "the closer you get to the ball."

The right forearm location and alignment to the shaft is going to change based on several factors 3 critical ones would be the delivery path, selected delivery line or arc, and plane angle. The right forearm is going to have a different look based on right shoulder location and the amount of waist bend as well. This is why a centered stroke is so important. If your head Bobs . . . then you disrupt the #3 accumulator angle and your clubface alignments will be fleeting as a result.