User blog comment:B214/Chapter 475 thoughts/@comment-24499036-20160229120024/@comment-5303512-20160229151104

Who said anything about Natsu and Gajeel alone? It will be likely the 5 first generation DS or all 7 DS. Dimaria is not an actual Goddess of Time, she is still human with god-like or close to God-like powers, remember Mira vs Sayla, there was a clear difference in power, until there was a way to stop cause her to be weakened. Plus with God Slayer Magic plus Third Origin along with Wendy with Third Origin, that would make things more even.

Third Origin doesn't have to be Mildean based magic, like Ultear said, Second Origin is something any wizards have but is unused until Ultear can unlock them with her Arc of Time. It is no surprise that such a thing as a third container of unused magical power can exist, that is why it is from the future, that is what the future does, progress, and that is why Ultear is here, the bring a bit of that progress with her and give it to the Sky Sisters, I also wouldn't be surprised if Third Origin is significantly more powerful than Second Origin.

Last I checked, that Mildean reference was only for the Last Ages spell so her God powers it cannot effect anything other than that one spell.

Even so, If Dimaria truly is the God of Time as you claimed it to be, then why is she having such difficulty with Ultear's presence? That means Dimaria is not omnipotent as you said she is, then there is little to no chance she can stop the Third Origin from happening.