Since multiple PGA Tour winners had so-called "flying elbows," why is it considered a swing fault? For no good scientific reason...it is a purely made up notion. If you have adequate leg work in your golf swing, which need not be of a professional caliber, your backswing position can be uniquely yours and you should still be able to deliver a square club face at impact.

The Amateur Golfer's Dilemma and my other books can be viewed here:
https://deflame.com

You can also go directly to Amazon and search for The Amateur Golfer's Dilemma.