Yoda and Obi-Wan discuss why Dooku let Anakin Skywalker live during their fight on Geonosis, as to why THEY think he told Obi-Wan Kenobi about the Sith Lord, Darth Sidious. The answer from Palpatine himself will be revealed in an upcoming video, but until then, here are Yoda and Obi-Wan’s belief as to why all this happened.