User blog comment:Calvincambridge30/Versus/@comment-3481504-20151023054224/@comment-26982641-20151024191045

Twilight, when Cas fought with Tamiel, he was weak (not mentioning he gained all of his previous powers but still they were weakened due to fall) and Tamiel was empowered by soul feeding. The fall did not affected Grigori because they fell milleniums ago. As we see Tamiel kept his wings. He was fully recovered, empowered by soul feeding and beat a weakened Seraph. I cannot guess the result if Cas was at full power and Tamiel had no empower but they are nearly same I guess. But that doesn't mean Grigori is stronger just because Castiel get rekt.