It is true that a goal of a vertical stacked rear forearm would result in further displacement of the elbow away from the body. That excuse was actually used in one argument to support having a vertically stacked forearm. The excuse was that large chested ladies needed to swing this way. That however was just an excuse and more a demonstration of not properly understanding swing fundamentals.
Not long ago we had a few posters discussing the virtues of not swinging in the "frontal plane", but in the "sagittal plane".
I had one hitter that was so large that she went through two breast reduction surgeries. At no point, did she ever need a modified swing because of her extremely large bust size.
Maybe this here will help ....
I have to say you are the best expert I know of, that can copy and paste. You are such a good student of what everyone else posts. I commend you on that...
Do you have any original thoughts of your own backed up by any kid you work with? This is the world wide web.
You claim to work with students of every level.
Any parent out there on the world wide web claim this guy as your hitting coach?
SL