Second, as I said, the uncensored tracks could be DLC, so that the contents of the discs were still within ESRB guidelines.
I have to stop you right there, because it doesn't work that way. Remember what happened with Oblivion? The game was supposed to be rated "T", but some online mod made it so that you could have your characters run around completely nude, so the ESRB changed its rating to "M". The mod wasn't even part of the game's official content, but it still affected the rating. Even if the uncensored tracks were DLC, just having them available would raise the game's rating.
(P.S. If I'm wrong about any of the above, please correct me.)
Happily discovering new music through the RBN since March 2010.