User blog comment:B214/Light Novel Volume 16 spoilers/@comment-162.202.198.72-20131019090351/@comment-1359322-20131019090636

No Rizevim isn't more powerful than Great Red.

Also there is no Divine Dragon in DxD only the Dragon God, True Dragon, Two Heavenly Dragons, Five Great Dragon Kings and the normal Dragons. The Evil Dragons don't have a ranking among Dragons.