abcdefg. This becomes very intriguing the further it goes. When you think about it in a Natural Turn the hand is foremost to the body therefore must go first if it is to remain in its coprrect position. By trying to do the turn through the body only could result in the lose of position of the left hand. Just as a bit of additional information I was told by a first class couple that he will send a bit of information through a signal between the two thumbs to his partner on what he wants her to do next. Just one of the tricks of the trade.

The hands will move in very nearly exact coordination with the shoulders, so you shouldn't need to put them in a position inconsistent for any figure. However they are connected to the shoulders by intent, not by arm muscles - they aren't locked, they simply float, holding the parnters. If they end up in the wrong place, the body moves to match the hands.