User blog comment:Western Gen/Speculations for Season 13/@comment-29956848-20150811023500/@comment-26797089-20150812133906

Well, you'd be lying to yourself if you claimed that Sharkface accomplished nothing, and didn't move the plot. On two occasions, he saparated Carolina and Epsilon from the group. The first time, if she had stayed with Tucker, Caboose, and Grey, rather than gone off to fight Sharkface, she would have been there when Felix was on the edge of the cliff with the Great Key, and she may have been able to stop him and get the key back then and there. The second time, she had removed Epsilon from the tunnel system of Armonia, resulting in Wash and Kimball not being able to get to the reactor fast enough, and Doyle going instead. If Doyle hadn't gone to the reactor, he would still be alive. So, as an indirect result of Sharkface's actions, Charon got their key, and now they can use it. In regards to the "low note" that the subplot ended on, you have to keep in mind that Miles intended for his death to be an anti-climax. It makes sense too, Sharkface was intended to be a foil to Carolina, a representation of what she could have become if she hadn't let go of her desire for revenge in Season 10. And his death was intended to show what happens when you can't let go. In Miles' words, "You get shot in the street like a dog".