Why I think ---- isn't a traitor
(Please don't mind the long post; I have a couple of theories) I'm very stressed over this question since I've been admiring Luke the whole season and there could be a possibility he's a traitor to the group. That might not be true though.
While Carver is asking the group where Luke is, he recalls the past and says something about where the group followed Luke instead of Carver. So Luke and Carver don't seem to be the guys that would be the mischievous duo because of the competition over the leader role.
The worst thing is that the only hint we get is of Kenny saying Luke was whining about something and Kenny ditched him. I think that before Clem could be given the option to sneak away and meet Kenny, Luke was "whining" about Kenny's plan about sniping Carver and his group. Luke probably thought the same thing as Clem, fearing that Carver would kill the hostages if he did shoot. Kenny didn't listen so Kenny told him to take a hike. Luke gives up and tries to sneak up on the dilemma and try to negotiate with Carver before Kenny would get hostages killed, but he's too late. What do you guys think?