I think one thing to keep in mind is that there is more than one way to throw either the peel or the rollover drop. Or perhaps more accurately, more than one technique.
For example, I've never liked the pull back/slip a piece of paper out method for the peel. Although I saw it taught in clinics and on video by some pretty accomplished coaches and pitchers, it made no sense to me. Why pull backward when you're trying to throw the ball forward. So I worked out a way to do it where you're pulling the hand over the top of the ball. It provides good, sharp drop (if the release zone is small) without a significant change in pitching mechanics from the fastball (although there are some nuances to it, such as starting the release as you come into your butt and making sure you get up and over the pitch). Not saying that's the "right" way, but it's the way that made sense to me. I teach that to most of my students and they have had great success with it.
I also teach the rollover drop to some because it suits them better. One girl just converted from peel to rollover, in fact. On the other hand, another just converted from rollover to peel because it works better for her.
The point is we all view certain things with these pitches from our own points of view, and/or what has worked for us or our daughters. What works with one way of throwing them may not work with another.
For example, I've never liked the pull back/slip a piece of paper out method for the peel. Although I saw it taught in clinics and on video by some pretty accomplished coaches and pitchers, it made no sense to me. Why pull backward when you're trying to throw the ball forward. So I worked out a way to do it where you're pulling the hand over the top of the ball. It provides good, sharp drop (if the release zone is small) without a significant change in pitching mechanics from the fastball (although there are some nuances to it, such as starting the release as you come into your butt and making sure you get up and over the pitch). Not saying that's the "right" way, but it's the way that made sense to me. I teach that to most of my students and they have had great success with it.
I also teach the rollover drop to some because it suits them better. One girl just converted from peel to rollover, in fact. On the other hand, another just converted from rollover to peel because it works better for her.
The point is we all view certain things with these pitches from our own points of view, and/or what has worked for us or our daughters. What works with one way of throwing them may not work with another.