The man who wrote the movie itself, Ron Friedman. We are email buddies so I just asked his view and among other things that were said, "They merge to become one as Cyclonus because neither can dominate the other." Now, is that a full proof explanation? Of course not. Is there some holes in it? Sure. But this is a comment from the guy who wrote the thing. If he says they merged into one, then I am happy to live with that.