Though a little bit difference, I think that is something to help to remind/restrict the right elbow location.
Yet, I still don't deal with the right arm address = impact alignment...because you are not showing that to me...haha
Nice swing!
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If you cannot take the shoulder down the clubshaft plane, you must take along some other path and add compensations - now, instead of one motion to remember, you wind up with at least two!