This is more common than you think with a lot of pitchers, I’ve found. For whatever reason(s), I think that the mind and body have little reason to overthink the process – it’s unknown, “let’s give it a shot” kind of thing. I’m under the opinion that the body is far more relaxed and willing to go with the flow without that “I must do this-n-that" mental and physical rigidness. But then again, perhaps there’s a lot more to the process than I’m aware of.
I’ve had pitchers, that for whatever reason, wanted to add another pitch to their inventory – picked up the ball, then with the basics of how to hold, reared back and with about two-thirds game speed or less, let the ball fly…. and bingo… it’s a beauty. Following that first one, with a second try, and not so good (compared to the first try.) The pitches that I’ve seen work better than not on the first try, with curveballs and fastballs by location… especially fastballs up-n-in. But then again, this has been my experienced based on the pitchers that I’ve had and the environment that those pitchers and I were in.
Now I haven’t seen this with every single pitcher that I’ve had, but enough to expect it without too much fanfare, or tweaking this and that. It just happens. On the other hand, with concentration and practice, the pitch that they were trying to master did come around with practice.
If you can video yourself during your entire pitching cycle and pick that cycle apart, perhaps you’ll see something in that mix that will be a “must do” for the future of the pitch.
Great topic by the way and nicely put together by Throwin_smoke79 and GeniusAnimus.
I would like to add this to my response. We as human beings are not machines that can, and will, do the same thing over and over again with precise repetitiveness. We'll add just a enough variation, regardless how small, deliberately or not, to every single move that we make, physically. This is what makes the pitching process, coaching pitchers, and your experiences so challenging. Sometimes just the slightest variation in one or more parts of the body can, and will, make a ton of difference in the outcome of what that pitcher is trying to accomplish. Add to this, age, physical condition, environmental conditions and no wonder this act (pitching) is so demanding on everyone.