“My own counsel will I keep, on who is to be trained!”
Counsel =/= Council
Got it. Regarding Vader, Yoda does mention to Luke how powerful his father was though. And he also warns Luke about the Emperor. It’d seem pretty strange to me if they never actually met.
Was your interpretation that he was just viewing them through force visions or something?
Also, Ben telling Luke about how he “tried to train Vader just as well as Yoda” is another hint that they were connected somehow. I can’t imagine that in all his years training Anakin, Ben would never think to bring up Yoda.