[X] The Coming of the King.
-Pros: On a surface level, an easy crowd-pleaser, especially among those who particularly hate Shinigami or love great battles. On a deeper level, a subtle reminder that your Lord is not one of your kind.
-Cons: Possibly displeasing to Aizen. Ulquiorra will not be fooled.
Look, I'm going to be blunt here. Las Noches cannot last. There are a few power centres that remain here, and Barragan is one of the ones who's a known quantity. Yes, he's a brutal tyrant, but he's a known brutal tyrant.
Let's suck up to him with a populist, crowd-pleasing opera that appeals to the lowest common denominator and gets everyone cheering his former deeds. As
@Revlid previously argued, Barragan's patronage and favour is a powerful thing, and doubly so if he's roused himself to actually trying.
(Clearly it is time for the arrancar version of
Leela: Orphan of the Stars with Ulquiorra playing the role of the Robot Devil. After all, he's a devil)