(SPOILER)Well, Younger Toguro went through Spirit World when he died, so I'm assuming all demons would just as humans do. I'm just saying, though, wouldn't one of the most dangerous demons to enter the human world be on a priority list or something to at least look for?

Also, spoilers for episodes about 75-80:
(SPOILER)I found another reason why Kurama is awesome. I think that when he took Gourmet's head off and trapped Elder Toguro in the Sinning Tree, he became my favorite Anime character ever.