User blog comment:Lambda1/"We Happy Few" - Discussion/@comment-31214924-20160521102429/@comment-34326521-20160521214843

Metatron is the only angel who actually knew about The Darkness. Castiel was guessing based on the stories he'd heard. We know very well she can't wipe out every threat simultaneously with a wave of her hand; this was established.

This is what I'm talking about. You guys keep complaining about "plot holes" and how "the episode didn't make sense", but you ignore every established fact to do it. The episode makes perfect sense, if you take into account everything that's been shown and established.