User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-120.28.131.148-20120502112534/@comment-3045936-20120502160557

Idk myself, but Cas said that Lucifer would twist the boy evil and then with a word destroy the Heavenly Host. Maybe as Lucifer is the second oldest and stronger Angel could give the boy the needed knowledge to do that, as he might not know how to himself.