Unlike the Jedi, who have an entire order made up of thousands of representatives, the Sith operate under what is called The Rule of Two. Established in Star Wars Episode I: The Phantom Menace, when Yoda says, "Always two there are. A master and an apprentice." In canon, this idea is laid out by Darth Bane after the large number of Sith turned on each other, allowing the Jedi to defeat them. Bane laid down the Rule of Two to allow the Sith to operate in secret without the Jedi being able to detect them if they were in large numbers; a solid idea in theory, but one that raised some questions for many fans.

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