Never argue with an idiot. They will drag you down to their level and then beat you with experience.......
The spine gets bent. It is not the action maker.
FFS is favoring a waist separation model.
I don't believe you need to teach those shoulders to rotate like that!
The topic is that FFS is promoting a rear lower back axis point for the swing. He is also advocating an action of spinal bend. Both are waist separation.