User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.198-20170101172200/@comment-31137559-20170124204827

Issei and Vali belong nowhere near this list. Remember that every mythology exists in DxD and there are a lot of gods. And there are still devils that could curbstomp both Issei and Vali. And Heavenly Dragon is nowhere near the top tier gods. Saying they are god level means nothing when there are different levels of gods.