Obi-wan talks about how Yoda was his master. And then the prequels suggest it was really someone else. If Obi-wan had suggested that Luke's mother was Mon Mothma or something, and then we found it was Padme, yes I would have a problem with that. I know, I know, "point of view." Well from my point of view the prequels have some sloppy writing if their goal was to match up with the clear meaning of dialogue in the original trilogy.