[BerntR]

Follow-through is "Both Arms Straight". If Impact occurs while the Right Arm is Bent but straightening, then how could the Left Arm move precisely with the Chest?

That would be when and if the hands move on a steeper plane than the shoulders. With a horizontal hinge and a shoulder turn that is flatter than the inclined plane, the right arm has to straighten to keep up with the chest - as seen from the plane of the "chest turn".

I'm speaking a little hypothetically here; On one side I believe this has to be done to combine a steep hand path with a shallow shoulder turn. On the other side I think it is worthwhile to aim for having all forces running on plane through the impact zone.

I was practicing some bermuda short game today. I have been struggling with that for some time. The prectice was a solid reminder of how important it is to get the forces on the inclined plane through impact. I had to lift my chin and drive my Right knee towards the ball to make that happen. And then I had pretty good control out of some pretty bad bermuda lies.

Remember that at Follow-through, both Arms are straight, which locates the Hands in the center of the chest. The Left Arm won't become 90 degrees to the Chest until about the Finish Swivel. The Left Elbow needs to bend to allow the Hands to pass "Center of the Chest" Both Arms Straight.

Yes, and perhaps even slightly towards the right of the chest center since the right hand is below the left on the club shaft.