User blog comment:B214/Season 3 confirmed!!!!!!/@comment-1359322-20141212134202/@comment-175.144.233.148-20141212233554

Could Volume 5 & 6 combined be longer than Black Bullet, Oda Nobuna no Yabou and Date a Live which combined the first 4 volumes into 1 cour, or Madan-Vanadis which combined the first 5 volumes into 1-cour.

All these series are good series and even with the anime cutting out so many contents still went on well. Even Date a Live, their season 2 which covers 3 volume, Volume 5-7, did well and the volume 5 of DAL was as long as DxD's Volume 5, while DAL 6-7 was longer than Volume 6 of DxD.

So seriously guys, i don't see there'll be any issues in season 3 being 1-cour especially when it's getting a better treatment than most LNs, TNK could have very well compressed Volume 4-6 in 1 cour but they didn't, i believe that's very good already.