Okay, here's one: Darzu is a Sith title in the same vein as Darth with the difference, of course, being that it comes after one's chosen name. I've pretty much always seen the "Darth Tradition" being its own subset of the Sith Order, with very specific beliefs and practices*... so why not have the "Darzu Tradition" as a competing cult within the Sith Order? So, yeah, bring on more Darzus! * Which Krayt's Sith do not adhere to, thus their being branded as heretics by Darths Nihilius, Bane and Andeddu. The One Sith, in my opinion, don't understand the significance of the Darth title. A'Sharad just assumes it's a title any Sith can claim, much like Bane does initially... the difference being that the latter actually went on to recieve instruction from a Darth.