I'd like to add some things as it pertains to Anderson’s curveball. Let me start by saying I am a college pitching coach and have been using this type of data on my guys as well.
Encheff is absolutely correct in what he’s saying. If indeed his spin rate is ~1700 RPM then that is equivalent to a average high school CB or well below average college pitcher in terms of this pitch. When my guys first step on campus and we get them on Rapsodo (fiming software used for video analysis) I expect to see a round 2000 RPM at the very least. The other thing to note is a pitchers true spin vs. total spin which equals his spin efficiency and that’s data we don’t currently have on Ian. For instance, our #2 starter (has best CB on staff) has a 2626 RPM total spin and 2265 true spin which equals ~86% spin efficiency, which is really good.
What I am saying is that if in fact that number of 1700 is correct, he would need to be in the 95% of spin efficiency for this pitch to work. With all of this being said, there are two things I’d want everyone to consider. 1.) Anderson’s CH is a plus pitch and typically for young guys is the hardest pitch to master. The organization (every org has a different philosophy) could have said let’s get this pitch to plus status then turn the attention to your CB/SL after we get this pitch to where it becomes your primary secondary pitch. Guess what I’m trying to say is most pitching coaches can improve a breaking ball (see next point) but the CH is harder to develop, so Braves could have had Anderson put most effort on CH and will now turn attention to CB . 2.) There are some new studies that show guys that struggle with a breaking ball are starting to throw a cutter. By throwing a cutter and learning what different pressure points do to the baseball as it pertains to your release point it can vastly improve spin efficiency which in turn can/will improve your breaking ball.
I’m not a know-it-all by any means and wanted to chime in on this topic as I love all the data available to use now. Not trying to step on anyone’s toes but I hope this helped a little. In the end, Encheff is right and if this is truly what Anderson has for a BB then to me it’s nothing more than a “show me pitch) but I defiantly wouldn’t give up on him because if he can refine that pitch (usually the easiest to get big jump of improvement) he has top of the rotation potential.