I still do not get your point. You can pull lines out of context from Orthodox sources just as easily. Out of context, what do these sentences from St. John Chrysostom's Liturgy imply? Without context, or without a more complete text of the liturgy and without at least some foundational knowledge of Orthodox teaching you could be 'taken' apart by some Protestant polemecists.
From the First Antiphon:
Through the prayers of the (Theotokas/Birth-giver/Mother of God), O Saviour, save us.
(I inserted the alternates of "Theotokas/Birth-giver/Mother of God" as alternate translations interchange them, but they all refer to St. Mary, the Ever-Virgin, Birthgiver of God.)
From the Second Antiphon:
Through the prayers of Your Saints, O Saviour, save us!
But you went beyond your first, initially over-broad question to state:
I also do not see support from the Fathers that we should be "dependent on Mary" or "offer all our prayers and oblations to God through Mary" and "But if there are Orthodox who essentially see our relationship with God as being channeled through the Theotokos, I wonder how they defend that from the Fathers."
No one who is Orthodox would defend the excess of Marian devotion found on some of the web's more notorious Rosary or Co-redemtrix pages.However, there are certainly numerous pious Orthodox Christians who have a particularly keen reverence and love for the Theotokas and there are many pious Orthodox who have special reverence for other Saints. What is the problem?
Not that I have any particular expertise with respect to the 'Magesterium' of the Church of Rome, but I do not think that the above statement accurately reflects the teachings of the Roman Church on Mary.
Would one of our more learned Catholic posters care to comment?