The answer
The Gospel readings of the Agpeya coincide with specific events of that hour. The Church chose the most fitting readings, not by writer, but by content. St. Luke was not one of the disciples, and neither was he a close eyewitness to most of the events as the other writers of the Holy Gospel, yet his account is used more than any of the others in the Agpeya. Our Church is not choosing one over the other because one evangelized the Egyptians while another was commissioned elsewhere. They are all our fathers and teachers and we are their children and disciples. The prophet David did not write all of the Psalms, but rather most, at least seventy. However, we say in the Agpeya prayers, "From the Psalms of our teacher David the prophet," because we are attributing the spirit of these sweet praises to him as the example of this component of worship. Do not be dismayed by this. St. Mark is revered throughout Christendom in every denomination. He is the respected and undisputed founder of the first and original Divine Liturgy, which was later translated verbatim by St. Cyril I, the Pillar of Faith. We are blessed by all our Christian heroes and grateful for each of their contributions. That is why we recite their exemplary lives from the Synaxarion in every Liturgy, whether they were from Egypt, Antioch, Rome, or anywhere. We are all lovingly bound together in the body of Jesus Christ.Answered by His Eminence Metropolitan Youssef (opens in a new tab)