Well, I think you're right. But I still don't understand :) probably because I'm not Jenn. I just wondering if Aes Sedai would give this task to Aiel, knowing what they have to sacrifice :(
Have you ever wondered why Jenn Aiel didn't sing the Song during they journey to cultivate some plants and have food? They've meet Ogiers during they passage, so they could receive some help. I don't know, maybe Jordan gave some information concerning this matter?