Not sure you're talking about the same move: when you say "elbow turn" I see (and it looks like MizunoJoe too) a movement of the entire arm from the shoulder. That could intefere with the pressure on #4. #3 release is pronation/supination, a movement of the forearm ("wrist movement" in TGM terms).
No, #3 release(Throwout) is the LFW being driven off-plane by the driving right shoulder in order to deliver the sweetspot to the ball.
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