Exactly, and not only Origin Cave, but also Seafloor Cavern.
I didn't see that either because it's not what I said lol. I said that the way how two conflicted leaders (N and Ghetsis) caused the fight between two legendaries (Zekrom or Reshiram vs Kyurem) is similar how Archie and Maxie caused Kyogre vs Groudon fight. And then, fight is stopped by fusion (Black or White Kyurem's appearance), kinda like by Rayquaza's appearance.
I think those events are similar to each other (not literally, but schemes are similar) and different from what happened with Creation Trio in Platinum because Dialga and Palkia don't even fight with each other and there is also only one team leader Cyrus, not two leaders like in Emerald or B2/W2.