After years of thinking 'damn these are weird!' I finally sat down and watched all of them. And now the story makes sense to me! :D I especially love that you took the time to animate sign language, which must have been tricky.
Goldminaz - Everything being said in sign language is what the characters are actually saying, they're just signing additionally because the darkness in Xochipilli's ears has rendered him deaf. The reason the signs go on longer than the vocal, tho, is that every name has to be spelled out.