Pyron, you're just making yourself look dumb when you try to save face. You've already conceded, there's no need to keep looking silly.
And I already proved they could. Neo Exdeath was in the rift between universes when he said he would end existence, go play FF V. He wasn't just in FF V's universe when he said this, he was in the rift where the Void was housed that lets Gilgamesh travel between the universes. Exdeath > All of Zenosaga, he solos, end of thread.