Rumor: Travis Fimmel from Vikings to play John Teller in First 9
There's speculation that Ragnar will die this season on Vikings. So the Mayans MC is a smokescreen. They will surprise everyone by announcing Fimmel, who looks a little like Hunnam, will portray John Teller in the prequel. That would be shocking.
I hear FX thinks the First 9 is a sure thing and the Mayans MC is a tougher sell. Think about it, you have a young Clay, Unser, John Teller and of course Gemma. That's TV gold. They want a sure thing after the disaster that was The Bastard Executioner.
http://www.gamenguide.com/articles/51477/20161003/sons-of-anarchy-prequel-theory-charlie-hunnam-lookalike-travis-fimmel-to-play-jax-tellers-father-warcraft-star-leaving-vikings-season-4.htm