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The one holy catholic apostolic church has historicity and the legitimacy of the keeping the Bible. The faith communities that devolved since the sixteenth century only have historicity back to the Catholics. If they assert their parents were illegitimate, they have impeached themselves and the faith once delivered to the saints.

Both the Eastern and Western Catholics have historicity back to the Apostles and the faith once delivered to the saints.

Both churches accept the decisions of the first seven Ecumenical Councils of the undivided Church. These are:

The Council of Nicea
The First Council of Constantinople
The First Council of Ephesus
The Council of Chalcedon
The Second Council of Constantinople
The Third Council of Constantinople and
The Second Council of Nicaea.
There is therefore doctrinal agreement on:

The divine and human natures of Jesus
Apostolic succession
The threefold ministry of bishops, priests and deacons
The broad structure of the visible church
The sinless life of the Blessed Virgin Mary and the honour due to her as Theotokos
Invocation of the saints
Acceptance of the seven sacraments
Confession to a priest
Use of icons in worship
Solemn celebration of the Eucharist and affirmation of its sacrificial nature as identical with the sacrifice of Christ
The Eucharistic bread and wine becoming the body and blood of Jesus Christ
Neither Church community subscribes to the Protestant teachings expressed in the five solae, 
especially regarding the teachings of salvation through faith alone (which these two communities understand as requiring no acts of love and charity) 
or of sola Scriptura (which they understand 
as excluding doctrinal teachings passed down through the Church from the apostles in the form of sacred tradition).

Simple yes or no....do you accept the Greek Orthodox position on the pope?

From your link:

Orthodox theologians hold that there is a marked difference in the teaching and understanding of the Trinitarian doctrine both East and West.

The sinless life of the Blessed Virgin Mary and the honour due to her as Theotokos

You're in agreement in being wrong.

Luke 2:22-24

When the time came for the purification rites required by the Law of Moses, Joseph and Mary took him to Jerusalem to present him to the Lord (as it is written in the Law of the Lord, “Every firstborn male is to be consecrated to the Lord”), and to offer a sacrifice in keeping with what is said in the Law of the Lord: “a pair of doves or two young pigeons.”

Leviticus 12:7-8

Then he shall offer it before the LORD and make atonement for her, and she shall be cleansed from the flow of her blood. This is the law for her who bears a child, whether a male or a female.
'But if she cannot afford a lamb, then she shall take two turtledoves or two young pigeons, the one for a burnt offering and the other for a sin offering; and the priest shall make atonement for her, and she will be clean.'"

Sinless Mary??

Not according to Rome's Book; 1 John 1:8 If we claim to be without sin, we deceive ourselves and the truth is not in us.

That's the way it is WRITTEN.

THIS is the way it is TAUGHT: 1 John 1:8 If we claim to be without sin, we deceive ourselves and the truth is not in us; the only exception being Mary, Mother of GOD, of course.

Rome has made IT's 'Mary' into a HYPOCRIT, by painting her as SINLESS, yet writing of her going into the temple to make a SIN offering.