Its simple, the inquisitor is not sith. Pulled from wookiepedia The Pau'an male known as the Inquisitor hailed from the planet Utapau, where he born over fifteen years prior to the Invasion of Naboo.[2]After Darth Sidious, publicly known as Supreme Chancellor Palpatine, transformed the Galactic Republic into the Galactic Empire and declared himself Emperor, the Inquisitor came into the service of the Empire and the Sith. Though not a Sith himself, the Inquisitor was tasked with hunting down and eliminating any Jedi who had survived Order 66,[1] the order given to theGrand Army of the Republic by Darth Sidious to destroy the Jedi Order