User blog comment:B214/New anime 2017 discussion blog/@comment-1359322-20170213060957

Yes i changed the blog title. Anyway, thanks to a discussion in animesuki, a certain thought came to me. What if Le Fay doesn't appear in the next anime. What if the next anime actually continues the story from BorN instead of going back to the novel/main timeline.

Ishibumi and those involved called the upcoming series a "new anime" instead of Season 4 like the previous season. Plus we have some info from DxD EX.

""The time period we are from——the world of the future, is a parallel world, or at least that's according to someone who has the faculty of being able to observe the timeline. Based on what that person said, this timeline is undisturbed, but that the history of other timelines is already different with each step you take forward."

"There's a certain timeline in which the Seirei of the Chichigami did not appear. Since there was no contact with the Chichigami, there apparently wasn't any inference made about the existence of a parallel dimension.""

And this:

"“I have one more brother who is a magic user, but… he is born in the original timeline, so I have to fix the future for him to exist.”"