Sure, but according to episode 5 and 6, Yoda must have taught the technique to Obi Wan, since he was able to force ghost in both episode 5 TESB, and episode 6 TRoTJ. Therefore any Jedi after the clone wars episode that Yoda learned the ability in, should, theoretically, have been told about the ability by Yoda, because there’s almost no other explanation as to how that ability got spread throughout the Jedi so quickly, when it is clear that it didn’t spread throughout the Sith.
it’s all retconned anyway.
How is it all retconned? Yoda learning the technique was a clone wars episode which is still canon
Sure, but according to episode 5 and 6, Yoda must have taught the technique to Obi Wan, since he was able to force ghost in both episode 5 TESB, and episode 6 TRoTJ. Therefore any Jedi after the clone wars episode that Yoda learned the ability in, should, theoretically, have been told about the ability by Yoda, because there’s almost no other explanation as to how that ability got spread throughout the Jedi so quickly, when it is clear that it didn’t spread throughout the Sith.Edit: I replied to the wrong comment.