Since so much with TAR revolves around sheer force of will (which is why the strong-willed Nynaeve and Siuan were remotely better than the rest even without much training or raw skills) it's really hard to believe Moghedien has the confidence and strength of will to make the most of her skills unless she's on her own in TAR, even if in theory she knows more and can do more than Lanfear or Moridin. It sounds like these two, the WO and above all Egwene would outclass Moghedien in an open TAR fight just because of their much stronger will. In TAR like elsewhere, Moghedien most likely would have to strike from the shadows to hope defeating them. In an open contest, she'd probably go down because her will and confidence aren't strong enough. Sooner or later her cowardice or weak personality would make her doubt even for a split second, panic and falter, and she'd be finished. It's interesting incidentally that when Lanfear faced Rand at the docks, she approached it quite a bit as a duel of wills as if she was fighting in TAR. I really wouldn't want to challenge Lanfear to a duel of wills in TAR... If Egwene or the WO need to face Cyndane there during TG, it will be nasty, a lot more so than if they have to fight Moghedien.