User blog comment:EmpyreanSmoke/Weaknesses/@comment-69.64.58.255-20151001043355

I think I see where you are having the problem. All archangels are angels, but not all angels are archangels, and are lesser than archangels. By Death saying angels it doesn't mean archangels as well, it just means angels in general. He probably would've referred to the archangels in addition. The Leviathans were sealed away by God, but we do not know if he had the archangels help him as well. Just because something may be older, it doesn't mean they are more powerful. We still don't know the full timeline, but if the Leviathans were made first, God may have made the archangels specifically to help him defeat the Leviathans. This hasn't been said in any episode either, so I don't think it should be on any pages either, unless they say it on the show, or at a con.