I dont know Countess and neither Colwell neither will I ever hardly read their books because I am German. So I contributed something what I thought could be helpful.
Generally I wonder if NWT wants to say relating to their texting "a God" that this is to be understand as "identification of the logos" or as "characteristic nature" - predicate nominative before verb - of the logos what is also "Trinitarian view?
I think that latter is from the context the only correct understanding.
Not that the word is this or that god or perhaps any god, or simply a God of more of its kind. But god is the divine nature of the word. And that the word has all attributes of the divine nature, of god
Even if you say Sherlock is a puppet, the question is do you identify it as " a puppet " one from many or as being of puppet nature possessing all attributes of puppets. But puppet is not an adjective
Or e.g. Miss So and So is artist, the artist, or "an artist would be an identifcation: an artist of many or the artist. Definite or indefinite.
Or is "an artist" a predicative noun to be read : artist is what she is. This is what describes her best. Her nature, profession, characteristics.