Harner has gone beyond Colwell's research and has discovered that anarthrous predicate nouns preceding the verb function primarily to express the nature or character of the subject.
Yes, I have read the article, and I can say that the position does not exclude the indefiniteness or the definiteness of an anarthrous. Again, I have to say that only the writer knew if he meant by "kai theos hn ho logos": "The Word was God" or "the Word was a god".