I sent a Tweet to Matt H. of Theoryland who will be meeting with Brandon today. He want to clarify the strength thing. As I see it, if we can learn if Graendal is stronger (or weaker) than Nynaeve, much will be cleared up. So Matt will ask Brandon more on this.

Incidently, if you want Matt to ask a question for you, go to Theoryland, there is a thread for that.