Jasmin Gimenez of Book of Mormon Central gives a good overview of a presentation Mark Wright gave on the Nephites and their relationship to the Obsidian Order, not of the Cardassians of Star Trek (alas--the idea of Elim Garak having some connection to the Nephites would have been nerdtastic) but the Maya:
Star Trek Fan Theory: The Nephites were part of the Obsidian Order
Star Trek Fan Theory: The Nephites were part of the Obsidian Order