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
English
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Guess Vader was too OP to reprise his Jedi hunting role in the show?
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Vader was never really a Jedi hunter. Grevious dooku jango/boba and the inquisitor. A couple others were for hire such as aurra sing cad bane zuckuss 4lom the list goes further.
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Could've sworn Vader personally hunted down some of them.
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Not to my knowledge. Obi wan came to him both times they fought in movies. The only thing that may be considered is him taking down the Jedi temple with the clones.
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Alright. It's been so long I didn't really know anymore.
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Granted I may be wrong. Its been a long time since I dwelled in lucusverse
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So he fills something of the same role as Grievous.