User blog:Nightband/Season Seven Plot Hole?

I know this is somewhat of a repost, but the last one was very poorly worded and didn't get to the point, so let me try again.

In Survival of the Fittest Dean and Cas end up in Purgatory, and Cas explains they ended up there because that's where Dick would go after he died. But that brings up several problems.

1. Only beings with souls go to an Afterlife (Heaven, Hell, or Purgatory), and according to Death the Leviathan are older than souls and therefore have none themselves, so Dick should not have gone anywhere after he died.

2. Someone mentioned that what the weapon does is send Dick back to Purgatory. But if that's the case then it didn't kill him, and the Word or God was lying.

Crowley mentioned the weapon having a "side effect" and that being what sent Dean anc Cas to Purgatory, and that works perfectly, but I believe Cas's words may have created a plot hole.

What do you guys think?