[Fish Sandwich]

If you want to pretend Kyomu is part of the Xross Saber, you can always go with the logic that not being counted at all is the most appropriate possible "presence" for a sword that represents nothingness. I mean, there's a reason the Bladriver goes "____ Battou!", right?

Anyways, I just realized something about Xross Saber that makes me love it even more. It and Elemental Primitive Dragon have a similar thing going on to Grateful and Mugen in Ghost that I loved there, where they each represent different peaks for the character rather than just being a progression on a single straight line of More Powerful.

In Saber's case, the whole tagline of the show is that he's a master of both swords and books, so each of those gets its own thing. Elemental Dragon is literally a story Touma created using his power as an author, while the Xross Saber is a direct product of the experience and resolve he's gained crossing blades with all these other swordsmen. I'm sure he'll still end up with a new Book or two somewhere down the line, but considering how hard it is to top Elemental Dragon's origin, going in a completely different direction for the final form was a pretty smart move.