Masema is Osan'gar! Osan'gar has the body of a male borderlander, we heard about "The Prophet" around the same time that A'g and O'g were created, It would explain why he stroke a deal with the Seanchan about Perrin, and his reaction to being taken to Rand were sadistic glee. (Which would fit nice with Aginor). (This happens in the last "Perrin/Faile" section in tPoD). It would also explain how "T P" could get so many followers in such a short time. At least this is my beleif for the moment.