Peter A Goldsbury
The Google link you cited about the purification of low ranking priests is from the blog of Michael Glenn, of the Bujinkan Dojo of Santa Monica, but he gives no source for his suggestion.
Oops, I didn't post a reference, did I? I actually found the text I quoted here: http://www.creative-arts.net/kabuki/...%20content.htm
and the page is copyrighted by Michael Spencer. Somebody seems to have been cribbing from somebody. He provides an email link, so I went ahead and fired off a query. I'll post here if I hear anything back from him.