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The operative illusion here is that co-Redemptrix means anything different than what the Catechism, posted at 11,441, teaches:

she did not lay aside this saving office but by her manifold intercession continues to bring us the gifts of eternal salvation .... Therefore the Blessed Virgin is invoked in the Church under the titles of Advocate, Helper, Benefactress, and Mediatrix

The title of Advocate is Biblically specific. It DOES NOT apply to Mary:

Job 16:19-21 : 19 Even now my witness is in heaven; my advocate is on high. 20 My intercessor is my friend as my eyes pour out tears to God; 21 on behalf of a man he pleads with God as a man pleads for his friend. NIV

1 John 2:1 : My little children, these things write I unto you, that ye sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous: KJV

"Mediatrix" is obviously refuted by:

1 Tim 2:5 : For there is one God and one mediator between God and men, the man Christ Jesus, ...NIV

Here again we have Mary's venerators intruding on Christ's sovereign province on her behalf. There is only one Mediator, one Advocate.

title of Advocate is Biblically specific

Not especially specific. 1 John refers to the Father being "an advocate" (not "the" advocate), and Christ spoke of the Holy Ghost being Paraclete, that is, advocate.

The notion that no one can advocate or mediate before Christ because Christ is mediator to the Father is illogical. It is also refuted by the very passage where that mediatorship is proclaimed: "I desire therefore, first of all, that supplications, prayers, intercessions, and thanksgivings be made for all men" (1 Timothy 2:1).