And good examples, too!  Thank you.  I don't bring any particular expertise to these issues, and I definitely come at them from the West.  I think we in the Roman Church have been anxious for Christian unity since even before the Council -- the Graymoor Friars have been at this work for more than a hundred years.  I think there is a Gospel imperative to pursue it ("That they all may be one, Father, as I in you, and you in me: that the world may believe that you sent me.")  I take your point, and I agree that we can't be facile about this in spite of what sometimes seems to be the urgency of it. 
I think we can and should seek unity, but not at the sacrifice of principles. I think, too, that sometimes we have to accept that unity is not in the cards. I think, for instance, that it is long past time for the Roman Catholic Church to let the Lefebvre group go its own way.