The Star Wars saga would have played out very differently had Dooku become the Sith Lord, rather than Palpatine. Darth Sidious believed himself the greatest of all Sith Lords, but in truth he was largely the beneficiary of all those who had come before him. A thousand years ago, Darth Bane had reinvented the Sith based upon the Rule of Two. He had reimagined them as Machiavellian schemers who operated in the shadows, working in secret to undermine the Jedi and the Republic.
In keeping with this, recent Star Wars tie-ins have suggested Darth Plagueis was the true mastermind of the Star Wars saga — not Palpatine. So many of Palpatine's strategies and secrets originated with his master, including his decision to position himself in the political arena, confident the Jedi would be blind to his influence as he ascended in the Senate's ranks. Even Palpatine's most sought-after power, the ability to conquer death, was learned through Darth Plagueis. Palpatine may have killed his former master sometime before the prequel trilogy, but it seems as though he simply continued to act in accordance with Darth Plagueis' plans — and reaped the rewards of doing so.
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Recent tie-ins have seemed to imply Darth Plagueis could easily have chosen another in Palpatine's stead. The latest Star Wars anthology, Stories of Jedi & Sith, subtly hints Dooku — the man who became Palpatine's apprentice — was drawn away from the Jedi by the dark side. Palpatine was not yet Sith Lord at that point, raising the possibility Plagueis considered Dooku as an apprentice instead of Palpatine. It's fascinating to imagine how differently galactic history would have played out had he made
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