The new one, Cook, I don't know enough about to see if he's a candidate.
Loesch stumbled onto the GB and has the same mentality as many typical rank and file, not sure he's capable.
Splane is a self-deluded zealot in the vein of Fred Franz.
Morris is a hardliner who'll be right even when he's wrong.
Lett has an air of innocence, but I think there's more going on in that head than meets the eye. He can be mean if he doesn't know you're looking.
Sure, Herd is a mysogonist who's loyal to the org, but he's softened recently and knows a lot of it is crap. Still, he's just tired and doesn't want to rock the boat.
So for me it's down to Sanderson and Jackson.
Sanderson is the youngest and is still very idealistic and hero worship-ey regarding his senior GB fellows, but he's bound to have seen many things he never knew of in the past few years on the team, and still has a chance to come around to a situation that would make him defect. He also doesn't have a JW wife to hold him down.
Jackson seems to be the most easy going of the bunch. In his talks he also seems the most likely to insert thoughts about less legalism, more compassion, and more focus on Jesus. He seems to sincerely believe in the org, and probably feels he was justified in using theocratic warfare at the ARC, probably even being prepped on what to say before going. He also has his language teaching book listed on Amazon and was seen with not a very close shave in two pictures when he was younger in his life story. He also still has a chance as he isn't too old yet, his parents still being alive.