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Ron D said: The only question that remains is can we deny this essential relationship and remain with the bounds of orthodoxy? Put another way, can one remain orthodox and deny that the Second Person is the Second Person apart from being the Son of the Father?

No, he shall perish everlastingly. From the Athanasian Creed,
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Whosoever will be saved, before all things it is necessary that he hold the catholic faith. Which faith except every one do keep whole and undefiled, without doubt he shall perish everlastingly. And the catholic faith is this...The Son is of the Father alone; not made, nor created, but begotten.