While on the floor of the Senate, looking up at the cackling Emperor above him, Yoda clearly realized that he couldn't beat Palpatine in one-on-one combat. As considerable as his own power in the Force was, Palpatine's at that moment was even greater, and to continue fighting would likely only result in his demise.
Yoda still stands as one of the most powerful characters in Star Wars, yet even he couldn't defeat Palpatine. After their battle in Revenge of the Sith, Yoda felt beaten and fled into exile on Dagobah, where he hid away for 19 years.
He understood he lost the ethereal battle before their physical fight even began. Thus, Palpatine never viewed Yoda as a major concern, even though the Jedi Master fought him to a de facto draw during the events of Revenge of the Sith.
Originally Answered: What if Yoda killed Palpatine? If Yoda killed Palpatine, and the duel between Obi-Wan and Anakin Skywalker went the same was as in the movie, then the Sith would be destroyed as no one would come to Anakins rescue.
Why Yoda COULDN'T Beat Palpatine BUT Mace Could!! - Star Wars Explained
Who was more powerful Yoda or Sidious?
Even though Sidious mastered all forms of lightsaber fighting, Yoda can smash anybody (besides Luke in episode 7) in a lightsaber battle. Brute strength: Palpatine takes it. Palpatine can lash out with the force and do more damage than Yoda in one lightning bolt. Control: Yoda is the clear winner.
In this example, the Jedi would likely have failed to survive the Empire. Thwarting Order 66 would only delay the inevitable. With almost the entire galaxy on his side, it would only be a matter of time until Palpatine wiped out the remaining Jedi.
Yoda struck the Podium too hard to control his landing, and he rolled off the main portion to the edge where he desperately attempted to climb back up. His hold on the smooth edge failing, Yoda lost his grip and fell several stories to the floor. Yoda chose to retreat as Sidious cackled in triumph above him.
When Anakin fell to the dark side and became Darth Vader, Yoda was saddened, but firmly believed he was beyond redemption and forgiveness, and ordered Obi-Wan to hunt down and kill him. Even as a Force spirit, Yoda continued to believe that Vader was irredeemable and there was no good left in him.
As the grandson of Anakin Skywalker (on his mother's side), one of the most powerful Force users in the galaxy, Kylo Ren has the appropriate bloodline to destroy Palpatine. It was a redeemed Anakin Skywalker who killed Palpatine the first time, and the same midi-chlorians flow through Ren's veins.
In addition, the supposed son of Emperor Palpatine, Trioculus, had been crowned, although it was left disputed as to whether it was valid. Emperor Palpatine's official heir would normally be Lord Darth Vader, as he was his Sith apprentice and the Supreme Commander of the Imperial Forces.
Yoda had to shoulder that decision for years. However, he ultimately understood the importance of life, and the power he could have used to defeat Dooku would have been much better used to preserve two lives. Over the years, Dooku would commit countless atrocities and also suffer incredibly embarrassing defeats.
Yoda's presence on Dagobah was likely hidden due to his mastery of Force Stealth and the planet's connection to the Force. Yoda, with his enhanced Force abilities and potential home-field advantage, would have had the upper hand against Darth Vader if they engaged in a lightsaber duel.
Windu has created and fully mastered Vaapad, a variant of Form VII. Yoda mastered the original variant known as Juyo. Both of them were able to fight with Palpatine on equal ground, matching him blow for blow. It is stated that Yoda beat Mace in a sparring match.
Moreover, throughout the duel, Yoda continually adapts to and even matches Palpatine - forcing his enemy to constantly attempt new tactics. Palpatine clearly hated Master Yoda with a fierce passion, but he was under no illusions that the Grand Master would be easy to defeat.
From the moment Palpatine began to plot his takeover, nothing he did was out of the goodness of his heart. Everything would transpire in a way that would give him power, and any niceties were a way to fool his enemies into underestimating him.
Palpatine himself seemed to have a positive relationship with his mentor Darth Plagueis, and while he tortured Darth Vader to bring out his strength, he also gifted him Mustafar as a show of respect, having first offered his own home planet of Naboo to his apprentice.
Star Wars Explained - A long time ago, in a galaxy far, far, away... Why didn't Yoda train Anakin Skywalker if he really thought that he was "the chosen one"? Yoda didn't want Anakin trained. He considered him to be dangerous, full of fear which could potentially be catastrophic.
Some clones disobeyed the infamous order than decimated the Jedi order, and refused to execute it. SOME of these Clones include; Captain Rex: Captain Rex, as most know removed his chip that would later be the way that Palpatine would execute order 66. Wolffe: As with Captain Rex Wolffe removed his bio chip.
So, it's likely Yoda didn't want to interfere and alter the future, as he'd be at risk of preventing the Sith from being defeated many years later. While Yoda sensed that the Sith's plan involved the Clones, it was too late to prevent Order 66.
