I don't think we were ever "the Warrior of Light" pre-Sundering. The legendary warrior that Elidibus is channeling seems to be an early incarnation of Ardbert's soul-shard.
Maybe he'll finally stop trying to push his "we both love violence for violence's sake" line on me then.
I feel like we've missed the opportunity for a shift of perspective for Zenos though. I remember when he first popped up again in 4.3 and we were wondering where he might go from there, and the answer has disappointingly turned out to be "straight back to what he was doing before".
If you're not going to take a man's physical death and revival in another body as a storytelling chance for some introspection and shift in perspective, when is it going to happen?
And since they've gone that way, I don't know where they could take it from here. As much as his relentless "there is nothing in this world but battle" thing gets dull, having him find compassion (or any degree of care for others) at this late stage would feel trite.
In some ways it's a path we've already trodden with Omega and its late realisation of the importance of the soul, but Omega was questioning along that line from the start and wanting to understand even if it was entirely ill-equipped to do so.
Zenos doesn't need to understand what drives us. He knows. He's entirely wrong about it (give or take your personal interpretation of your WoL's motives) but he knows - not that it really matters so long as we give him a good fight out of it.
I just rewatched the scene - she's arguing with Arenvald when her eye lights up and she gets flashes of our past, and she immediately grimaces. It doesn't feel deliberate to me.
Other scenes imply she's sensing other people's thoughts without even showing the Resonant eye effect, from wincing in cutscene #2 of "The Price of Freedom" (where we don't know what's going on with her yet) to an outright Echo-headache in #5 of "Return of the Bull". It lines up with Arenvald's observation and indicates that she is constantly getting these unwanted flashes of emotion, if not actual visions, from the people around her.
I don't know if that supports or detracts from my impression that her looking into our past isn't deliberate, but the simplest argument against is that there's no reason for her to be doing it in that moment. She doesn't choose to look into others' pasts and she wasn't even focused on us at the time.
I think she can voluntarily call on the intended effects of the Resonance - the heightened senses "listening" for her opponent's next move - and everything else is an unwanted side effect she can't control.
Maybe the eye effect in that scene is just to emphasise or confirm that yes, it is her Resonant powers giving her these visions.