I believe you are laboring under a false assumption, like the majority of human beings, looking for a quick and simple solution. You are looking ONLY at the numbers assigned by the 3 testers and not at the text and the descriptions of the balls. If you look into the text for many of the reviews you will see the statements that at least the tweener and the cranker both love balls that have significant backends.
If you read the text, you will see more detailed observations about the ball, how it used and how they think it cna best be used, often by which type of bowler.
Many Storm and Hammer balls are known for that characteristic, and thus, your assumption that BTM "favors" these brands. BTM does not favor these brands; those two bowlers (and maybe the stroker does also; I don't recall right now) favor that ball reaction.
Those ratings, the number assigned to the ball by each type of bowler for a specific oil amount, are the opinions of the individual bowler, not that of BTM, the magazine.
Yes, many people love balls with huge, sharp backends, but do they always score best with this type if ball. Maybe yes, maybe no. If you are not speed consistent, rev rate consistent and target consistent, such balls may give you 5 strike sper game, but they also, often, give you 2 washout and 3 wide open splits. That is not conducive to a 200-220 average.
You must learn to read the text describing the basic behavior of the ball from both the design perspective and from a use perspective. It depends on the release and delivery traits of the bowler doing the testing, as well as the oil on which it is used. Many reviews, like BTM and BJI (Bowlers' Journal International) now also mention changing the surface to see how they handle different oil pattern. This is also essential knowledge in learning how to analyze a review so you can get the best out of it for your own personal use.
Some balls' behavior stays the same with surface changes; some of them change a lot when you change the surface.
I never go by just the BTM review; I factor in the BJI review, whether they agree or not and I look at videos by people whose release and delivery specs are close to mine. If possible, I'd also like to see someone use it in person. All these factor into the decision.
