Dogs can thrive on Ole' Roy, but that doesn't mean that it is good for them. Heck, I fed my dogs Purina for years before doing my research and learning about what was going in my dog. Since I didn't go to medical school and am not a scientist - I am sorry to say I didn't understand a word of your link to a "scientific study of the digestibility of corn protien (and I am talking about the nutritional value of corn as applies to dogs so the E-Look link for nutritional value in humans is pointless as far as I am concerned.)
I can tell you from experience, when I removed all corn and soy products from my older rottweiler's diet it was easier to manager her weight, she had more energy, her coat looked better, she farted much less and pooped less.
And yes, I do believe (though of course, can not prove) that the food she ate before I put her on a premium food was in some way, if slight, the reason that I lost her to cancer instead of old age.
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