It is the nature of discussion for other people or topics to get brought up when talking about a subject. As long as it doesn't completely derail a thread and is related, it's fine. There's no rule saying you must only ever mention UTADA in the UTADA thread. There have been far worse OT things brought up around here and most of us are guilty of it, so...
I don't get why so many people dislike the Ookami song! I liked it from the first time I heard it. Not my favorite, but I don't dislike it.
Also, I listened to the album with headphones for the first time yesterday and the intro to Boukyaku is INTENSE. I loved it so much already, but man. I wish it was longer.