User blog comment:B214/High School DxD EX/@comment-24583889-20160310182046/@comment-26345952-20160508014015

@anon about the age theory I dont think we can use it sonce Shiroyuki and Kurobara were around 12-13 years old and were in this story.

However there was an explanation that the other children didn't appear was because they were not fighthers, they were not suited for the battlefield. Thus having these 10 (or so) children only travel in time, with Gasper