I think it is more that the other Survivors are next to be judged, not killed.
Eko wouldn't confess to doing anything he did to help people.
Does anyone really think that he was going to sell the vaccine? That was a trap for those
guys to come back and for Eko to kill them. He planned that. He gave the vaccine to the village, but he also caused them to loose a church.
Did anyone catch that Locke say Light when he looked at Smokie, but Eko saw black?