Does that mean that in particular the Pro Fastpitch pitcher taught something else than what she actually did? If there are so many coaches teaching the wrong thing, then I guess the successful pitchers are those who ignored their coaches.
I am finding out that this is exactly what is happening! When I first took my DD to her successful and very busy D1 pitching coach she taught her the "push the ball down the circle, pull up with elbow to catcher" nonsense. I didn't know any better but thank god my DD figured out on her own that everytime she threw the pitch using arm whip (IR) the pitch had more speed and 12 -6 spin on it.
For me, the Internal Rotation original post was eye opening because Boardmember did a great job of explaining how the shoulder, arm, and hand are predisposed to naturally rotate, with the palm facing inward towards the body. The flawed technique of pushing the ball down the circle and pointing the elbow to the catcher after release KILLS this natural arm whip (IR); and as many have pointed out, no decent pitcher actually does this. The other key point about IR is that the pitcher needs to be doing practice drills correctly that promote this arm whip. If you are a pitching coach and don't understand this, your students will likely struggle.