[Martee]

Maybe it is just me, but I have become a very strong believer that to analyze vids or pictures you need a starting point. The starting point that everyone normally uses is the address position (adjusted address) or Impact Fix.

I think you need to start at the real Impact, then go back wards.

Movement of the head by pivot momentum does not negate the stationary head, nor does it mean a sway or bob in all cases.

Lack of flexibility seems as if it would result in either a rotation with the pulling force, else any other movement seems like it would do more than just move the head and require compensation moves to get the head back into an area that the golfer could complete the golf stroke.

But I offer that those who notice movement or repositioning of the head during the early stages of the back stroke and no movement after that is that the adjust address is not correct.