I was with Nick Mastrani when he interviewed Tom for the 1991 Golf Illustrated article. The two of us took lessons from Tom. My experience clearly was that Tom want me to pull down on the handle of the club at the same time as I was shifting weight from back to front foot. Tom said it really is all about rotary motion. I am sure he taught different people in different ways depending on what they needed.
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!