Let's say you make two exact same swings with a driver.
One with a ball, and one without.
Would there be a noticeable difference in the look of the swing during or after impact? (obviously there would be no difference before impact by definition).
My understanding is that on a practice swing that feels like your regular swing, the clubface is significantly more open in the impact zone....something huge like 15 to 17 degrees. I believe that was for amateurs, not pros.
If that is true, then that suggests there is a very specific psychological component associated with the physical timings/movements....which then suggests that the best teachers have to be competent in analyzing the actual movements AND familiar with the psychological tricks that incentivize the proper movements by the student.
....and, it would be interesting to see the other components of the release phase in the practice swing (say path and dynamic loft, etc, etc), especially if we can assume that closure rate of the face can be corelated with un-hinging of the club.....because we may find that amatuers hold the angle longer in the practice swing and start the closure later. Maybe those two components need to be de-coupled to improve their ball striking? What does this mean?
Well, if we think closure rates don't vary much between pros and amatuers, but we know that pros hold the angle a little longer.....but still hook the ball, then perhaps the relationship between un-hinging and closing the face is specifically different for advanced players versus choppers.
What do I really mean by all this? Maybe it's not necessarily all about the difference in closure RATES, but rather WHEN a certain closure rate begins to achieve a square face at impact for that particular golfer.