Lets not forget Bene did change the "Filique" cause in effort to bring the Eastern Orthodox Church and the RC Churchs closer together.
But whats this about him being a mediator? How far is he expected to "mediate" surely as the head of his Church he is expected to put it above everything else?
Example, would you expect Bill Gates to stick up for Google and Apple? Surely he will promote his Windows before the prodcts of others.