I never stated that one should allow the head to move 12" in response to the pelvic rotation. I merely stated that the head would move by that amount if the golfer didn't deliberately restrain that natural movement by keeping the head stationary. Keeping the head stationary forces the mid-upper thoracic spine to become verticalised, which is a necessary biomechanical phenomenon if one wants to keep the upper swinger center stationary during the swing (which is very desirable).
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