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I thought Athelstan and Ragnar were great together. I thought the theological questioning (on both sides) was really interesting, and that the show has lost a bit of it's magic since then. Given Floki's recent interest in the mosque and self-proclaimed lack of purpose, I think it would be appropriate if Floki wanders down a similar path himself after having condemned Athelstan for leading Ragnar astray. I'm not too interested in the current plot lines, so something like that would definitely add some intrigue for me.
I notice that Bjorn isn't on your list either. What do you think of him? When he as a kid I thought he was insufferable, and since then he's kind of swung back and forth between being alright to being intolerable. I was just starting to kind of like him, but his recent behaviour has changed my mind again haha.