I'm thinking about it too. The Barsen'thor was said to have an amazing mind, was almost certainly a genius, demonstrated great will in using the Shielding technique so much and was able to resist the First Son's mental attack and help contain him in Syo's mind at the end. Furthermore she defeated Vivicar who has powerful telepathy. Plus s/he doesn't really have any big failings or demons or anything to be that afraid of. So I'm not sure how Zannah's mental attack would pan out.
Outside of that, Vivicar was clearly a sorcerer and a damn good one so Thor likely has ways of dealing with sorcery and experience against it. As well as incredible TK, though I for one still give that edge to Zannah, as well as raw power.
Zannah might win this on her saber skill though, in a fit of delicious irony. Or they'll stalemate long enough for her to power up a massive mental attack.
I'm a Bane fanboy. And Zannah was able to punt him into a wall with a Force Wave, even though he'd been channeling his power before the attack and as a Force Wave, the attack was spread out. So she's definitely equal to him in that regard imo. Plus she has fantastic feats as a child.
I consider Bane to be above the Barsen'thor due to his Lehon Temple feat, his disintegration feats and some more stuff. Though Thor is pretty close imo.
"He began to gather the dark side, the power slowly building. But before he could unleash it he was hit by a wall of thunderous force rolling out from a corridor to his left. Instinctively he threw up a defensive shield, absorbing the blow. Despite this, he was slammed against the opposite wall, knocking the breath from his lungs."