Over and over I've said it's obvious that Moghedien is the stronger of them, it's been made very clear throughout the series and I don't refute that.

What I've also said is that even massive strength deficits can be overcome by skilled opponents and that this quote is less about Egwene worrying over something she can't chang (i.e. being weaker than Moghedien) and more about the bigger issue, which is Moghediens overwhelming advantage in skill.

I also think Nynaeve would never have beaten Moghedien in a duel if she hadn't caught her by surprise and essentially made the duel an arm wrestling match. At that point in the series Nynaeve wasn't even as skilled as Alivia, and we saw what happened with Cyndane.

I find your continued point of view that everything OP related is directly related to how strong someone is rather blind.