" the top half is more 'scrunching' and pulling the front shoulder up "
After toe touch, yes the shoulders do 'scrunch'. But the important part is not that the front shoulder goes up, it's the rear shoulder to hip distance is scrunched. The timing and distance of this is one of the differences in high level and youth swings.
Many do not scrunch, so they spin (shoulder rotates, but it does not go down) and lunge forward. Most do not go down far enough. Almost every swing posted here, the hitter does not take their back elbow down far enough.
After toe touch, yes the shoulders do 'scrunch'. But the important part is not that the front shoulder goes up, it's the rear shoulder to hip distance is scrunched. The timing and distance of this is one of the differences in high level and youth swings.
Many do not scrunch, so they spin (shoulder rotates, but it does not go down) and lunge forward. Most do not go down far enough. Almost every swing posted here, the hitter does not take their back elbow down far enough.