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The literal teaching of Unam Sanctum is explicitly confirmed in the Liturgy of the Church:

"... it is impossible to obtain salvation except in union with the sucessor of Peter." (Raccolta, 1928 edition, Prayer for Reunion, no. 306)

In the Decree on Ecumenism of the Second Vatican Council:

Nevertheless, our separated brethren, whether considered as individuals or as communities and Churches, are not blessed with that unity which Jesus Christ wished to bestow on all those to whom He has given new birth into one body, and whom He has quickened to newness of life - that unity which the Holy Scriptures and the ancient Tradition of the Church proclaim. For it is through Christ's Catholic Church alone, which is the universal help towards salvation, that the fullness of the means of salvation can be obtained. It was to the apostolic college alone, of which Peter is the head, that we believe that our Lord entrusted all the blessings of the New Covenant, in order to establish on earth the one body of Christ into which all those must be fully incorporated who belong in any way to the people of God ... (Second Vatican Council, Unitatis Redintegratio, Decree on Ecumenism, 3, November 21, 1964)

By the great Fathers:

Our forefathers gave the name "Chair" to this feast so that we might remember that the Prince of the Apostles was entrusted with the "Chair" of the episcopate ... Blessed be God, who deigned to exalt the apostle Peter over the whole Church. It is most fitting that this foundation be honored since it is the means by which we may ascend to Heaven. (St. Augustine of Hippo, Sermon 15 on the Saints, on the Feast of the Chair of Peter)

It is easy to multiply these sort of authorities, but it serves little purpose if three such basic ones will not suffice to convince.

Do words not mean what they literally say? Perhaps the Arians could have been accomodated after all, had the Fathers not been so insistent on a literal reading of "consubstantial".

Brother Hermann. Holy Mother Church has authority to explain what Dogmas and Doctrine mean. She has done so via the Holy Office letter, issued with the approval of Pope Pius XII, to ArchBishop Cushing; with the Second Vatican Council; with the Catechism, among other sources.

Your personal opinions, while interesting, are not definitive. Holy Mother Church is both interesting and definitive.

The Patriarch of Rome is deserving of the Primacy of Honor,
(Primus Inter Pares) and anything else applies to the Western or Latin Church, not Eastern Christianity. As "Koko" stated earlier, Orthodox choose to overlook the unfortunate ramblings of the medieval Popes, etc. (in the interest of possible reunion)