Even in the TSP Swing where the hands and right shoulder are on plane from the Top, the hands move off plane when Throwout starts as the left shoulder moves off plane. If the hands stayed on the swing plane, the sweet spot would fly out over the ball, unless the shaft was exactly in line with the left forearm, which is virtually impossible, even if the left wrist were totally uncocked at impact instead of level as it should be. After Throwout starts, the hands move farther inside away from the base line as the golfer sees them, because the Left Flying Wedge is moving off plane.
Of course the hands are moving forward after impact(and during impact), but not "down".
10 years ago I would have agreed with you. 10 years from today (hopefully sooner) you'll agree with me.
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