Has George Lucas ever commented in an interview or commentary track on the duel between Darth Vader and Obi-Wan being the first time they met since the fall of the Jedi?
While the current Disney canon obviously has changed this and it does not contradict the strict literal conversation between Darth Vader and Obi-Wan - I think it is safe to assume this was meant to be the first time Obi-Wan has come out of hiding for an epic rematch of the Jedi purge duel - did George Lucas ever explain that. Like maybe how it rhymes :-)
VADER I've been waiting for you, Obi-Wan. We meet again, at last. The circle is now complete. When I left you, I was but the learner; now I am the master.