Interesting topic ... I'd like to hear a catcher's persepctive ... maybe Orlando could jump into this one.
Lacking any better terminology, when throwing sliders/curves, we always had our catcher set up for the "initial trajectory" of the pitch ... where he wanted it to start out... Same with tailing two-seamers. If a pitcher is getting 3-4 inches of movement on his 2-seamer he still needs an initial target. This would present an apparent illusion of missing his spot to an outside observer instead of nailing the pitch within an inch or so.
Interesting premise that they use in their software, but the question is how to really use it.