Fixed. Yoda fleeing allowed Palpatine to win, for a while. But Yoda lived to train the son of the Chosen One, the one who, after his father dies as the result of the injuries sustained killing the Emperor, has the entire fate of the Jedi Order on his shoulders. It is because of Yoda's training that Luke Skywalker is THE Jedi Master in the EU. Yoda lost the battle, but his decision to retreat ultimately leads to the Jedi winning the war. Ummm, says who? Whose plan? Luke didn't turn himself in on Endor to defeat the Emperor. He turned himself in to get another meeting with Vader, in order to try to convince him to return to the light. The attack on the Death Star was supposed to kill Palpatine, that wasn't Luke's job. Luke acted on his own, apart from the plan, to try to redeem his father. In fact, you might argue that Luke actually endangered the plan by doing that. Yoda wanted Luke to kill both, but, Luke didn't exactly follow Yoda's plan, did he? He found a 3rd option, and went with it. Given Yoda's defeat at the hands of Palpatine, it seems that the only Force user who could conceivably be strong enough to do the job was Anakin's proginy, Luke or Leia. Since they were infants, they had to wait. Even then, Luke didn't defeat the Sith like Yoda wanted, Anakin finally lived up to his destiny...albeit with Luke's help. Whiiiiiiiich never would have happened, had Yoda died. They couldn't. First, after Yoda's attack, I am sure that Palpatine fortified the defenses, specifically against Jedi threats. Second, he had the entire Senate believing the Jedi were traitors, Yoda and Obi-Wan got outmaneuvered politically. They couldn't engage in open battle with Palpatine once he proclaims himself Emperor. Might have something to do with Luke's midichlorian count. He is the son of the Chosen One, after all. If Anakin was conceived by the Force, Luke and Leia are 1/4 Force babies themselves. Given how strong Luke becomes in only a few short months on Dagobah, I think they had good reason to suspect he would be a fast learner. They didn't expect him to redeem Anakin, but if anyone was going to be strong enough to defeat Vader or Palpatine, it would be Vader's own son or daughter. Luke got the Jedi training because Leia was busy running the political side of the Rebellion. But, if anybody could ever be strong enough in the Force to defeat Darth Vader or Palpatine, it would be either Luke or Leia. They wanted Luke to kill, because they didn't think it was possible for Anakin to be redeemed. Luke proved them wrong, which only adds to Luke being the perfect choice.