“their opinion must be given promimance”
Credence, I can understand, but prominence?
As has been pointed out, one can make similar arguments for corn. for whatever reason, the general minhag is not to eat corn, since Quinoa is relatively speaking new, Poskim disagree how to classify it. Certainly, in the field of Kashrus the OU is a credible opinion, and you may certainly consider it the most prominent opinion, but it does not mean that one must give them the final say on all matters Kashrus.