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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Although all members of the Knights of Ren are Force-sensitives, they aren’t formally trained in the ways of the Jedi or Sith.
Source: https://gamerant.com/star-wars-why-do-sith-name-themselves-darth/
Another issue with the theory is reconciling the fact that Silvain was a Jedi who believed in the good the Order attempted to facilitate across the galaxy with the chaotic evilness of the Knights of Ren.
Source: https://screenrant.com/jedi-barash-silvain-knights-ren-mirinda-fan-theory/