Thread:Mnzombie/@comment-26517753-20150622103122/@comment-4311395-20150622193543

The staff producing High School DxD need to adapt the novel along with some required changes, whereas One Piece, Fairy Tail, and Naruto are only adapted from manga, which is much quicker and easier to do.

Anime adapted from light novels will always take more time than anime adapted from manga.