Doing reviews and working with digital tracking for almost 10 years, this is pretty easy to manipulate to make it look like whatever you want.
For example, did they move the arm at all from ball to ball? If you know a ball reacts a certain way, wouldn't the bowler adjust to find the right angle? I mean if the RipD hit like that from that line, why would you use that line?? Do you actually carry better with the Katana generating that angle or would the Black Widow Gold work better more consistently? We don't throw one shot, we bowl several games with several bowlers. Does the Katana reaction hold up or do you have to move more and change balls over the course of the night.
I'm not necessarily agreeing or disagreeing with the finding but like any experiment, someone designed the controls and it's clear their balls are set up to work so it's biased to their controls.
And I'm also not commenting on which ball is "better" in any case. I just think people need to keep that in mind when looking at these.
I can tell you we tested both the Katana and Black Widow Gold. They are very different shapes and both are really good balls. I've had certain house conditions where I felt that extra angle the Katana generated was too much but when you move to adjust for better pocket angle, carry changes. Gold blends better down lane. So how does this test tell you anything about that?
Anyway, food for thought...