Hmmmm, Koumaken seems to be overpowered, just how many demon flames can it hold (at once) ? What's more, it looks like Rin is starting to walk the same road as Ogami, collecting/completing all forms of flames ?

And this master, was it an exorcist or a powerful demon who was the original wielder of Koumaken, if a Demon, does it mean that all truly powerful ones wielded one ? Perhaps here again, those powerful weapons were made by demons to slay demons and that's why humans can use but only a portion if it's true power ?