User blog comment:EmpyreanSmoke/Supernatural Q&A (Closed)/@comment-172.101.67.105-20151115174443/@comment-24834479-20151115200122

1. No current plans for that to happen.

2-3. Answered below

4. I said that I was unsure what powerlevel Cain was at. With the mark, it is possible he could have beaten an archangel and leviathan. I don't think that he was strong enough to, but that isn't a definite answer.