[Jeff]

OB Left

All your comments about low point relative to ball position have no necessary causal connection with the "mental construct" of a pivot axis.

Each individual golfer can simply choose the biomechanical parameters that allow him to hit the ball with the clubhead still moving on a descending path at impact (ball positioned behind the low point) while remaining in good balance during the downswing. Some golfers, like Tiger Woods, swing their arms very fast across the front of their rotating torso in the downswing, and they may prefer to have a greater amount of secondary axis tilt at impact so that they feel that they are in better balance. Therefore, they will have to position their stationary head right-of-center at address when using a driver.

Also, some professional golfers prefer to have a rightwards-centered backswing where their weight distribution at the end of the backswing is right-of-center when they use a driver - because they prefer to have the ability to shift their pelvis left-laterally at the start of the downswing so that they can acquire their desired degree of secondary axis tilt by impact.

All these biomechanical choices are individual choices that do not require the golfer to think in terms of a centralised pivot axis, and I do not think that I have learnt anything useful if somebody chooses to define their swing as being "compensated" rather than "uncompensated" simply because that person harbors a hypothetical "mental construct" of a pivot center and a centralised pivot axis.

The only point regarding the pivot action that I believe is an essential requirement is the idea of a pivot stabilising point (eg. head or upper swing center), but there is no mandatory requirement that the pivot stabilising point has to be perfectly centralised between the feet. The desired position of the pivot stabilising point depends on the desired degree of secondary axis tilt at impact - that will allow the individual golfer to swing his arms very fast while remaining in good balance.

Jeff.