ak57,
I believe Ebonite only tested their own resin (and maybe particle) balls. Remember that all these bowling manufacturers contract out to different chemical companies to make the materials (resin, urethane, plastic) to design and manufacture the chemicals. Just because they all use resin does not imply they use the exact same molecular/chemical formual. Resin is not one entity; it is a family of chemical compounds. So it is entirely possible that each different resin used may react slightly differently to oil, oil absorption, and oil extraction and to the plasticizers used in each resin.
Thus, the death or reduction of ball performance in each bowling manufacturer's resin balls may be due to different causes. I doubt if each manufcaturer has tested another manufacturer's balls; they have enough trouble with their own.
Besides, if you read Brunswick's analysis, their results are such that oilabsorption is the main cause of perfromance degradation. AND oil extraction is the main solution.
So, basically, pick your poison and pick your antidote.
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"We get old too fast, and too late, smart."