Moe did it right… lining up the left arm and shaft from a DTL view through impact which is how you keep it all connected while swinging.
What happens to most who try swinging, is they enter on an elbow plane… and that then shifts independently to a shoulder plane post impact creating an equal angular spiral effect through impact where the shaft moves off plane and becomes more upright which I will never promote… and this is one of the main reasons I shift away from popular TGM instruction. Too much timing involved that way and ball beating to keep some kind of a feel for it in my opinion and experience doing that way for years.
