Yoda,
please have mercy.

Jeff is alone.
Others are not misled by him. They are learning from seeing him pounded, I think?
Jeff,
You do not need a new pair of glasses. Your vision is probably a lot better than mine. The problems lie behind your cameras, there are bugs in your computer! I am so glad that we think we can identify the locations of the particular problems. As a physician, you know well that correct diagnosis is a major step in fixing the problems.
Problem 1: Jeff’s failure to perceive rotation around the Z axis
Symptoms:
1. He is vehemently against AJ Bonar method of swinging.
2. The meshed gears in the mechanical wrist joint of the swing machine caught him off guard, he thought it was a universal joint.
3. He frequently claims the turning of the left hand without the corresponding rotation of the lower lever around the Z axis
Root causes:
Jeff is a physician who is used to articulated bone joints. Although he is very analytical, he was neither trained as a mathematician nor a physicist.
Treatment:
Consult nmgolfer or the lurking mandrin.
Problem 2: Jeff’s fixation on the clubshaft plane
Symptoms:
1. He frequently states that the only way to return the club to the position at address effectively is to swing the clubshaft on the clubshaft plane.
2. He refuses to fully accept the method of swinging the clubhead by keeping the sweetspot on the sweetspot plane.
Root causes:
Jeff’s over reliance on gadgets: plane boards, dowels, flashlights.
Treatment:
Consult any GSED