Board Thread:Questions and Answers/@comment-35950060-20200305052656/@comment-5398287-20200305213223

For the same reason that we don't list the grammatically correct form of the Espada numbers, despite the protests of Spanish-speaking readers - because we weren't presented with them.

...is what I was going to say, but I just checked the raw for Shawlong's introduction and it clearly has katakana over "No. 11", indicating that he did in fact use the Spanish term. However, there's a good chance it isn't the CORRECT form as with half the Espada, so we can't add them through guesswork - I'll have to add them myself.