Your questions have been answered through many readings of text and treatises but apparently you seek answers in conformance with what selections you choose to put forth.
But in a spirit of unity let me share with you a magnificent article written by America’s foremost Lutheran theologian, Rev. Richard Neuhaus (since passed away and founder of First Things) who converted to Catholicism.
This lecture for Christian unity between East and West was delivered at a leading Orthodox seminary.
I think you will agree with its overall tenor that draws from a symposium of speakers that included Orthodox theologians.
http://www.firstthings.com/article/2008/12/002-reconciling-east-and-west
I hasten to add a caveat that I intended to include in my immediately preceding post. Pope Leo did not accede to Canon XXVIII of Chalcedon. Nonetheless it was proclaimed by the Council and received all of the other local churches. So it certainly demonstrates that the rest of the Church was not buying Roman claims to anything beyond the honour due the Patriarch of the old Imperial Capital.
I will read your linked article a little later when I have the time to give it appropriate attention. However I certainly missed your response to my questions, especially the one on the Eighth Ecumenical Council. Could you repost the answer or point me to it? I can’t find a single word from you on the subject. Maybe I need new spectacles.
BTW another point I forgot to bring up, and one that I am guessing you were unaware of, is that next year (2016) we are actually going to convene a Great and Holy Council of the Universal Church. It will be the first since 1351 and if all goes well it may end up being the Tenth Holy and Ecumenical Council. The planning has been going on for decades.