My major objection to the Athrabeth being a part of the Quenta itself is that it is primarily a philosophical discussion which really don't aid or progress the narrative of the Quenta and it may not flow well. I view it in a similar way to the "Statute of Finwe and Miriel" and the "Converse of Manwe and Eru", both of which are in Volume 3. However, if you think it works well in the draft you have I'll concede.
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