I agree, no right or wrong, I have always been interested in why we put so much emphasis on that position at the top. If you are too steep because you do not turn your shoulders flat enough, or too flat because you turn you shoulders too flat, I can see how that is an issue. I think Brian's videos and posts hit on the real issue, which is compatiblity. If you swing your arms flatter, do you need to change your hip movement for example. I just think one needs to make sure that the left arm position is compatible with the other movements of the hands and body. If you watch Watson or Toms, their left arm position really fits well with how they move their hands and body. I think that is why Homer Kelly refers to the three zones. If you had Watson rotate like Chad Collins, he would have some major issues. If you had Collins move his body like Watson, he would also be inconsistent. The tee in each armpit drill that the S and T guys promote really makes you swing flat. Good luck