Notice how far back Tiger's head is. It has a direct influence on the rate of closure of the clubface. Tiger appears to maintain his left arm flying wedge, but the rate it rotates post impact is related to his head position. He used to (might still) get callouses (sp?) on his wrists from rubbing them together in his finish.
Don't you have callouses on your wrists too . . . . not the same reason though right?