For a guy who talks about peace all the time he's pretty damn violent. He talks like a mad man... I wonder if he's one of those crazy characters that defines peace as a world devoid of life.
Those disappearing stairs remind me a lot of the world between Hueco Mundo and the human world where Ichigo and Unohana traveled just before the fight against Aizen. I remember Ishida being really good at traveling there too...
But I'm not really sure about anything anymore... no longer sure what this guy is, what he wants, where he is, how he promotes people to his "guard"... is this really "the thing" that Urahara defended?