That should pretty well tell you it's not quite right.  It's just another way to try and make a concept and the skill of reading ball reaction mathematical.  There's no replacement for reading ball reaction or no way to lock down that many variables.  It's just another way to dumb things down, confuse people, and frustrate pro shop operators. 

Ball reaction isn't found in numbers or words, it's found in videos.  Even if the guy in the video throws the ball nothing like you, you should still be able to get a grasp on how it works.  I can watch somebody with a 250 rev rate that throws it 15 mph and know exactly what it will do for me.  The only other things I look at are RG and Differential.  Don't care what the coverstock is, don't care what the core looks like.  High RG balls don't roll soon enough for me and higher differentials generally make the ball flare out early so I just have to know that information for layout purposes, but it's all about reaction.