Egwene says she has no chance against Moghedien's strength. She is clear about that.

That means there is a big enough gap between them that Egwene would not even be able to put up a fight against her.

So we have an established gap of significant magnitude between Egwene and Moghedien. A gap of sufficient size that there would be no contest between the two if it came to a battle.

So since Egwene gives us this wonderful comparison between herself and Moghedien, it provides us with a benchmark to compare Egwene to any channeler stronger than Moghedien.

Nynaeve EXACTLY matched Moghedien's strength in Book 4, but Nynaeve was not close to her maximum strength at that point in time. In fact, as late as book 7 or 8 we are told that Nynaeve has STILL not reached her full potential. In ACTUAL fact, I seem to recall a reference as late as Book 9 saying Nynaeve has still not reached her full potential.

So. We know Egwene is significantly weaker than Moghedien. And what's more, she admits that she would have no hope if confronted by Moghedien. Just to clarify that she is indeed referring to the difference in strength here, Egwene later says that Nynaeve is the only sister in the camp who could match one of the Forsaken. Since we know that Egwene is far more SKILLED than Nynaeve, it is clear that Egwene is referring to STRENGTH and not skill when talking about her inability to match one of the Forsaken.

Now, we know that back in Book 4, Nynaeve is already at a point where Egwene would be easily overwhelmed by her strength. So how much STRONGER will she be once she reaches her full strength (which is not yet attained by Book 9?)

And then to top it all off, when Nynaeve arrives at this point of full potential, she will only be equal to Semirhage, who it seems was outmatched by Graendal, who in turn was outmatched by Cyndane who in turn was outmatched by Lanfear.

In any case, it is clear that there is a significant gap in strength between Moghedien and the other female Forsaken. And in turn, it is clear that there is a signficant gap in strength between Moghedien and Egwene.

So the only logical conclusion is that there is a MASSIVE gap between Egwene and Nynaeve.

Oh wait, this fits exactly with RJ's statement alongthe lines of "Nynaeve's potential shines like a bright fire compared to Egwene's candle flame".

How much clearer can it get?

You are grasping at straws, and you know it.