I think this Verge article does a better job at highlighting the new facts
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the GB parody came to the attention of the BBoys by an ad agency that was coordinating a contest for ads to win a timeslot during the Superbowl. It seems the ad agency was double-checking to see that the music rights had already been cleared. Given the Superbowl is where people go to watch advertising in between violent intermissions, I can see how the BBoys would not have liked to be part of that.
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the BBoys recent filing includes trademark claims as well, which seem to be a cleaner argument for them to win. I would not be surprised to see this decided on the trademark issue (either through settlement or decision) while not touching the more interesting copyright issues .