My current belief regarding the identity of "Nakomi" is thus: I believe it to be Verin Sedai. After re-reading key points in many books to completely understand the timeline... I've found that Verin would be dead at the time of the meeting between Avi and Nakomi. However, this is actually WHY I believe it to be Verin Sedai. I believe that when she died she was inducted into the hall of heroes that are summoned by the Horn. Her deeds are great enough to worthy her a spot and we know they exist in T'A'R and we know they can interact with people in meaningful ways. Verin had the knowledge, Verin had the power and Verin had the heart.