It isn't as much the elbow position, as the direction the right forearm is pointing
Ideally the elbow, the tip of the right elbow, stays on the shaft plane.
the difference in elbow position, and hence the difference in right forearm 'in line' load, vs 'out of line' load, alters the rate of the #3 closing motion of the clubface - why swingers have more rotation than hitters
it is the reason that clubface control is via the left wrist, and not anywhere else, and is in zone 3
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