This is how I remember Tommy teaching the Start Down Move (which, of course, is how it really works). In fact, this is precisely The Magic Move Harvey Penick taught in his now famous Little Red Book (page 96):
"To start your downswing, let your weight shift to your left foot while bringing your right elbow back down to your body."
There is a big difference between your recollection of Tommy's advice to "pull down as you shift" and DG's steadfast demand that we uncock the right elbow from the top and in advance of any lower body action.
P.S. And this would be my Post #7,000. Thanks for reading, everybody!