Count Dooku and Luke Skywalker are the only Jedi in the saga that we know that have been trained by Yoda, as a one on one mentor and not just as a youngling. Dooku falls to the dark side. Luke overcomes it and ultimately saves the galaxy. Looking at it in a romantic and thematic way, can we see this as Luke redeeming Yoda as a teacher, where he failed with Dooku? I love the idea that there is a line of master-student: Yoda-Dooku-Qui Gon-Obi Wan-Anakin, Luke. Yoda trains Dooku. Dooku becomes a rebel idealist. Qui Gon inherits HIS rebellious streak from his master but he become enlighted by it where Dooku falls to the dark side. Qui Gon then passes this information on to Yoda who becomes enlighted in the true ways of the force and passes this on to Luke, who then with this knowlege saves the universe. Its a bit complicated but if you think about it it makes sense and provides a life lesson. Through failure you may find success. Yoda trained Dooku and Dooku eventually fell to the dark side, but Dooku also trained Qui Gon who become the only Jedi to discover the true path of the Jedi which is what ultimately restores balance to the force. When Luke overcomes the dark side, is it also, Yoda being redeemed as a mentor? Is it only through Dooku's independant nature that Qui Gon goes against tradition and discover the will of the force?