User blog comment:ImperiexSeed/Archangels are weak, don't you agree?/@comment-79.115.71.25-20151127175454

I think that the writers wanted in season 7 to make leviathans the most powerfull species, but that did not work out  and in season 10 they change they mind and say that Archangels are the most powerfull and they used Death to sad all that.