[ArmadaPrime]

Gotta say I'm insanely curious how Saikou's transformation will actually work! He's gonna be using a sword to turn into... the sword? Like, kaigouken saikou very much Exists before Yuri's transformed with it.
I at first figured his body would morph into a sword like Saber with King of Arthur, but then where would the version he's holding go... my current guess is that in-show the open ridebook will have blank pages, and Yuri will shrink down and become that little saikou torso while the sword just sorta floats in the air for a bit? It will make more sense with the Shadow but I got the impression that's an ability he can choose to use, not the default configuration, given that Touma also seemingly wields Saikou.

On another note I do have to give props for the very smart re-use (I guess slight re-tool?) of Calibur's buckle!