I'd say Hosea, because Sean's and Arturo's (the pilot's) deaths took me completely by surprise, and i didn't even realise Kieran was gone, because i was barely ever in camp, But with Hosea you can see him being held at gunpoint and then shot. Of course, i knew in a way that Sean and Hosea would probably die during the story because they weren't in Redemption (1), but then again, with that logic i also thought that at least Charles would die, which he didn't.