This was a very interesting scene because Lanfear is the only female Forsaken who is possibly dead, so it would seem that she is Aran’gar. However, we do not know that she is actually dead, and if she is then it has only happened recently, whereas Osan’gar seems to have been dead for quite some time. We have a few male Forsaken as candidates: Aginor and Balthamel were offed in Book 1 and Ishmael got caught on the pointy end of Callandor in Book 3. We know that Be’lal and Rahvin were both killed by balefire and so cannot be brought back. I would discount Asmodean because we do not know how he died, so he could also have been wiped from the Pattern, and it was very recently. If we assume that Lanfear and Moiraine are not actually dead, then Aginor and Balthamel seem to be the obvious candidates because they both died at about the same time and it makes sense for them to both be resurrected together. However, this means that one of them has been given the body of a woman . . .