Raymond Brown text about the Gospel of St John

Being married to a man who has a Masters of Divinity, there are some wonderful books that are tucked away in bookshelves all over my house, and I found a wonderful copy of "The Gospel According to St. John" translated and introduced by Raymond Brown. The Introduction reads like one of our articles for our class, and I read it last night when I couldn't sleep and got some interesting things from it.
Brown carries on the conversation about human authorship of the Bible that was brought up to us in class. There is no question that the text is divinely inspired, but to whom was it inspired? As Brown writes, "Is the Fourth Gospel as it now stands the work of one man?" He carefully and masterfully puts down all the arguments for and against this question, but MY question was, "Why does it matter?"
Why do we care if the events are out of sequence? The way they are told and have been arranged have emotional equity in them, and perhaps tell a deeper story than if they were sequential. Why does someone say they might have been "accidentally put out of sequence" (i.e., dropped on the floor and picked up in a completely diff. sequence)? I feel John is the most poetic, masterfully mystical Gospel, and it's the book I go to most often in my own Biblical reveries. AND, if God is in all details and this book is Divinely inspired (which we believe it to be, as Catholic Christians), this thought of there being an "accident" bothers me in its lack of understanding about Divine inspiration. In terms of "Multiple Sources", I'm okay with the fact that it came from the "School of John", as Father referred to it in class on the 30th. This makes perfect sense to me, and doesn't negate the fact that the book is divinely inspired.
I approve of Brown's handling of the text, that he "shall comment on the Gospel in its present order without imposing rearrangements". That he knew what the arguments against this action would be is impressive; that he respects God's divine mystery in the Inspiration of the book, I agree with. I'm looking forward to reading "The Tradition behind the Fourth Gospel" later.