User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-168.169.25.92-20151001132708/@comment-24834479-20151003193706

1. If you view Seraphim as higher angels, then they or some of them could be.

2. To wander the Earth and his other creations.

3. I don't know how that would work with the power scale. As I said, it isn't completely vertical.

4. If the leviathan didn't negate his powers for some reason, the archangel would win.

5. To fight the Darkness.

6. He was afraid they would destroy his other creations.

7. Definite possibility.

8. There are a lot of those. One that stands out was the Chaos one, which was planned for season 7.

9. I have no idea.

10. He wanted to work on other projects.