I am sorry Seraphim, I do not know the "Branch Theory" of which you speak. I only know church history. If you do not believe that Orthodoxy is the root of orthodox christianity, do you not believe that Rome broke from the fold in the 11th century and the Protestants broke from Rome in the 16th? How is it that we are our own tree if we share this history? And, I am not saying that Orthodoxy is a part of other churches, I am saying we share a history in Christendom.