Come to that, is Howling Coyote confirmed as deceased? And what's happened with the search for the site of the Great Ghost Dance, that some very powerful people didn't want to succeed?
I'm going to take these in reverse order.
First, the actual physical site of the Great Ghost Dance is, I suspect, immaterial to the magic; the particular valley may help, but it's probably not necessary, nor is it technically 'unfound'; see response to second question. However, politically, finding it would no doubt be a boon; James can lecture on that one.
Howling Coyote bit the big one in a self-sacrifice during the third book of the Secrets of Power -- foolishly, IMO, but there you go. Remember, if you die in astral combat, you die in the Real; your mind makes it so ...
