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Why didn't Darth Sidious have Darth Tyranus lead Order 66 in the Jedi Temple, since Palpatine knew that Dooku ordered the clones? Darth Tyranus is one of the best swordsman in the galaxy and he is a powerful sith lord, so why did Palpatine wait for Vader to lead Order 66 in the Jedi Temple? Why did Sidious choose Vader to lead Order 66 in the Jedi Temple?
EDIT: I already change the question to be more clear and accurate.
Sidious had the opportunity to replace his previous apprentices with a young, extremely powerful apprentice (Vader) by the time he was ready to issue Order 66.
Darth Maul was defeated by Obi-Wan on Naboo (and lost his position as Sidious' apprentice) before the clone army was ready, so Order 66 could not be issued while Maul was Sidious' apprentice.
Maul was replaced with Tyranus, who in his position of leadership in the Confederacy of Independent States helped foment the Clone Wars -- a conflict that was necessary to distract and set up the Jedi for mass execution by the clones. Since Order 66 was mainly carried out by the clones anyway (the attack on the Jedi Temple was only one of many simultaneous attacks on the Jedi), it didn't make much difference whether Tyranus or Vader led the attack; it would have been theoretically possible for Sidious to have Tyranus lead the attack on the Jedi Temple if Tyranus was still Sidious' apprentice by that time. However, Sidious knew he could seduce Anakin to the dark side and was able to get rid of the aging Tyranus by the time he was ready to issue Order 66.
Sidious was always looking for a more powerful apprentice -- it's the same reason why he later wanted to replace the injured and aging Vader with his son, Luke.
The main reason was that Count Dooku was the leader of the Separitists. To have him lead clones into the temple would make no sense. He had to die so Anakin could become Vader. Dooku's usefullness was at an end.
Sidious had been planning this for quite some time. Plagueis conceived Anakin directly from the force in an attempt to replace Sidious, which is why he murdered his master in his sleep. Sidious had been out to figure out who the vergence in the force was and claim that person as his own apprentice. This is all pretty standard stuff in the expanded novelizations and graphic novels. What I don't think Sidious planned on was Darth Vader getting himself crippled. One constant theme in 'The Rise of Darth Vader' and in the Darth Vader graphic novels was in how disappointed Sidious was in his new apprentice and how weak, comparatively, Vader had become. Anakin Skywalker was a true force bad-ass. Darth Vader was creepy and scary but was not nearly as powerful as he once was. Please don't ask me for quotes or page numbers. This is my recollection.
