The answer is you have no control. I responded “this” to someone asking something along these lines…and added a few more thoughts for the post today.
I am a believer that the body is smarter than the conscious mind and the golf swing is an action/reaction activity. Most swing flaws are just the body’s reaction to compensate for something that is already happening.
I can’t remember the last time I worked on something with someone that happened later than the transition.
You get the club moving correctly in transition, you are going to hit a decent shot. Even with a funky backswing, getting the club moving properly in transition is the key.
Now is you want to say the better the backswing, the easier it is to get the club moving properly in transition, you will get no argument from me.