First of all I'm going to have to ask you to learn how to spell the proper nouns.
Then I'm going to say that beating Xizor is not a big thing, He's a crime lord and the only reason he survived for so long with the black sun was because he didn't make any blatent moves against Vader, As soon as he did Vader wiped him out. Hiring bounty hunters is no great feat. All you need is some cash. Hutts don't really work for anybody so if you can prove that Vader hired a hutt I'm going to be very very scared.
I'm not in Revan's camp either for the knowlege of the masses. I'm a Ulic Qel-Droma fan. This is a guy who conquered the Mandalorians, was willing to kill sombody who would have been his wife, brought the Republic to its knees while Exar was working on the Jedi Order, and killed his brother. While Exar Kun had more power (not much in my estimation, He seemed more like Maul and Sidious put together) Qel-Droma was what made the War into a winning one.