The adjunctive does not change anything in a clause like this: "... the Word was with God and also the Word was divine."I don't know why you quoted so much. Here is what he says about J 1:1:
"The predicate is usually anarthrous, because it does not denote a definite person or kind or class but only property or essence, which is predicated of the subject. An example here is: Κΰρος έγένετο βασιλεύς τών περσών "Kyros was made king of the Persians". This text is an exact parallel to Jn 1,1c και Θεός ήν ό Λόγος or (in its ordinary form) και ό Λόγος ήν Θεός."