Darth Nihilus's leader ability
... his leader ability does not seem to affect Kylo Ren although he appears to be a Sith because he's wielding a red lightsaber. As noted by looking at what category Kylo Ren falls in, I don't see him...
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Because he wasn't truly trained in the ways of the sith. Just because he has a red blade doesn't make him a sith.
