What Happened, Happened… is just AN OPINION!
…stated by a character.
The line of dialogue had an episode named after it.
It’s not a fact. I don’t know why people keep stating it as such. It may prove to be so, but events in S6 so far kind of run against it. At best, they make it redundant, because things do happen, but then a bunch of other stuff can also happen alongside it.
OK, so this is more of an argument / short rant than a theory. Bye.