An Enemy Stronger than the Black Mage?

I bet when they release the door to the present, it'll be the release of Black Mage. Weaving the two story arks together seems a lot better to me than to just get one done, and slap another one after it and say it's connected. Just look at the Hero's that we got, they were slapped one after the other and therefore have a pretty inconsistent and confusing plot/timeline.