User blog comment:Xandermcc/Crisis on Earth-X + Dark Multiverse Theory/@comment-31350859-20171203060936

Dark Multiverse is basically all Batman-based. Each universe is created with Bruce's fear and every bad decisions that he's made or things he's regretted. The whole concept being Batman centered makes it highly unlikely to take place in the Arrowverse.

Probably in this case it's a different superhero but they need such number of characters and stories.