So far, these iksar have been the only ones to assist while pulling from the camps in the Emerald Jungle. In the camp by the great staircase, you can pull from a full spawn (5 iksar) without having any adds ... *unless* an abductor is there. As an example, pulled from a full camp. 3 picaroons, 1 abductor, and 1 other iksar. Pulled a picaroon from the back of the camp, and ONLY the abductor joined in the fun, despite running past everybody else in the camp.
So if you're looking to break a full camp, take the abductors first, then move on to the others. :)