Good questions.
He did go over the importance of the elbow plane; at address and throughout the swing.
He talked about the importance of using an underhand pitch motion for right arm swingers with clubhead lag. (I had never used that pitch motion before)
He told me that at the end of the backswing my left wrist will be cocked, flat with my right under my left and that they are delivered towards the ball in the same configeration. He mentioned that when the left wrist uncocks near impact, that makes the clubhead slighlty close and puts the clubhead in perfect position to strike it with sweet spot (near heel) with a clubface that looks way too open. He said I will be striking the ball from that position and that is when dual horizontal hinge action takes over to close the clubface through impact and send the ball straight.
He called me this morning to find out how I was doing and when I told him that things were coming along but over half of my shots were pushing to the right, he told me to study and practice dual horizontal hinge action.
I will ask him your questions when I talk to him next.