User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5120709-20120529162257/@comment-184.77.255.73-20120531212546

While Dick's plan was dastardly, it doesn't make him more dangerous than Michael/Lucifer. I mean, you're still able to fight Leviathans at the end of the day; the same can't be said for Archangels. The only possible way the Winchesters could off Michael or Lucifer is shivving them with an Archangel blade and even Gabriel couldn't manage to shiv Lucifer so...

P.S. Gray Buu is the second weakest -- Mr. Buu (the one that lost to Gray/Evil Buu) is the weakest.