It was the Council of Nicea that settled the issue of Arianism. I don't see the Church departing from this teaching, hence my demurral.—Robert Helfman

Then, we agree that the RCC is not changing its understanding of Arianism; but we differ in its relationship to understanding God.

Double Procession is subtle.  Double Procession means that the Father beholds the Son and the beholding is the Holy Spirit.  In that sense, Double Procession is unrelated to the hypostatic union.

The 381 Second Council of Constantinople solidified Filioque for the church.

The Protestant Revolt has nothing to do with Filioque.  

Without some explication, the spiritual sense of THE CHURCH is nonsense, 

That we all need to grow is what theology is and what theologians do.

This discussion can help the Faithful prepare for the Coming Christmas Season, God incarnate.