Not just the Gospels, the Epistles and the early Church Fathers as well. The Son is always portrayed as subordinate to the Father.
Mary is sometimes called Advocate today...
The meaning of the term, as used by Irenaeus (i.e. Second Eve advocating for Eve), was that of the Paraclete in Greek. The concept of Mary being the Second Eve is unbiblical; it is an invention of Justin Martyr's.
How do you know that Christ's divinity is not an invention?
When did you start believing the Bible is the single source of the Christian faith?
Yes, that is a good example of dogmatic development that would not automatically proceed from the Scripture.
The concept of Mary being the Second Eve is unbiblical; it is an invention of Justin Martyr's.
One can argue, with a fellow believer in the inerrancy of the Scripture, whether a comparison of Genesis 3 and Luke 1 would provide in itself a sufficient basis for Mary being a second Eve, but even if it does not, that would then be another example of dogmatic development that does not automatically proceed from the Scripture.