Yes the Ordos are not mention'd very much in Frank Herbert's books. Though they are very much like the Ixians, wonder if they just exchanged the two? I think the Atreides correlation is for the skin of poison. Though I guess drawing wildly from the books it could be all the times that they have been backstabbed (Suk Doctor), so I think it would make sense. Guess its time to read them all again.
Dunyain - At a loss to read Dune or play DivDiv