User blog comment:Enriant/Heaven and Hell/@comment-26982641-20160602080446/@comment-1975828-20160602092228

I think archangels are very powerful in comparison to Seraphs. Remember "Point of no Return"? Zachariah feared Michael's power. As for Raphael, he may simply have chosen not to kill Castiel. He wanted the angel to bow down to him. With just one hand, he literally, according to Castiel, knocked him into next week. He was coughing blood from it.

This is mostly my headcanon but, I do think Gadreel was a Seraph, even if not explicitly stated. Also, does fallen make a Seraph weaker than before? I thought Seraphs kept their powers with or without Heaven.