That explains a lot then. Although I find it kind of odd how they didn't even 'officially' announce Yukiko and Kanji during the release trailers and stuff, yet they were playable.
Oh well, Yu looks sweet. I've noticed that he can have Izanagi go from one attack to the next while he's summoned. Does doing so reduce the start up at all do you think, or is the same as if he summoned him for each separate attack?