A canceled Clone Wars arc starring Jedi Grandmaster Yoda would have explained one of Revenge of the Sith's biggest unanswered ...

The Republic, with the help of the Jedi, take on Count Dooku and the Separatists. With a new threat rising, the Jedi Council sends Obi-Wan Kenobi and Anakin Skywalker to aid the captured Chancellor.

However, his years of being a Jedi didn't stop him from becoming one of the most dangerous Sith. While Palpatine was the true mastermind behind the Separatists and the Clone Wars, Dooku was the face.