I believe that Cadsuane is Moiraine. If you think that Lanfear is back from the doorway, then why not Moraine? I think she could handle herself in there since she obviously knew that it was going to happen. And, being able to wish for three things, what would she wish? I think it possible that she would wish to come back as a legend, someone all the Aes Sedai would defer to, and someone who could lead them in support of Rand. Maybe, maybe not. Let me know what you think.