“2 rabbis are applying for a Rabbinate job, One is OO and one is a YU Rabbi”
Good example. The Kol Korei is just what is needed to deal with such a case. The synagogue membership will now know that if they are Orthodox, the YCT candidate is not at all a viable candidate. A perfect way to make an objective, absolute decision.
On the other hand, if you say the YU guy is a nice fine person, that does not guarantee that the synagogue members are not charmed by the YCT candidate, because as we all know they are trained, slick, snake oil salesmen.
You have shown exactly why such a Kol Korei is helpful and needed.