Pulling balls foul has nothing to do with hip rotation. Nothing at all. Pulling balls foul is a hand path problem. The hands get ahead of the hips and the result is a pulled foul ball.
Hitting inside the ball and pushing the ball to the opposite side is the hands getting too far behind the hips. If you want to teach that go right ahead. It would be nice to at least know what your teaching.
ian, yes..but maybe a little flatter and farther behind
OK, next question.
Lead elbow hinge angle.
I know there is a huge range of variability due to personal preference, but is there/should there be a minimum and or maximum that the hinge angle should be at teh time of contact with the ball?
Just look at Donaldson's hinge angle. But with his upper body strength, he can bring his lead elbow out as his swing moves forward. therefore decreasing the hinge angle.
Or how about Griffey's hingle angle what looks like 130-150*.
Is it different with boys vs. girls, due to upper body mass and strength?
The hands have already fired by the time the rear hip starts to extend..... that is because the hip/hips are reactive..... when someone has the thought process of firing the hips first you get what the OP is suggesting.... the only thing that a hitter can do with that kind of stretch is unwind swinging around the body and so on. I have been down that road concentrating on the hips firing is a dead end.... The hips GET FIRED.