I love how the music in O12 is a mix of Maker's Ruin and Torn From the Heavens, I'm always a sucker for that trope of incorporating the main theme(s) into the final boss music, although it does make me think that it's a bit unsuited for Omega... maybe it's because he's using your own tactics against you but still, I think Omega-M and Omega-F were meant to be something more but I guess they couldn't work it into the story in a good way so they settled on making them another form of Omega.