I hope you'll forgive the necro, but I've been wondering about Zenos' abilities and thought maybe someone better versed in lore could shed some light.
Iirc a big part of Fordola's story is that because Krile was used as a 'template' for her resonant abilities, she gained an extraordinary degree of empathy along with everything else and is now tormented by knowing just how much people hate her. I can't remember who explained it but I do recall someone telling the WoL that the Echo manifests in different ways in each individual and that if a different Scion had been used, the result would have been very different.
That got me thinking about Zenos. He has no empathy (as far as I can see), in fact he seems completely unable to feel anything, which led me to wonder if Krile really was the 'template' for him. Could it have been someone else? Could Minfillia's kidnapping (which we foiled way back in ARR) have been part of this project? Were all the scions involved in the attack on the Waking Sands accounted for?
Really interesting to note that Zenos appears to have undergone the procedure twice. Which means Krile could have been used for the second procedure but doesn't explain why the effects seem so dissimilar to Fordola's, unless going through such a drastic procedure twice has made Zenos less 'stable'.
When we see Asahi's past in the cutscene in the A Rise of a New Sun quest, Zenos's makes a dramatic entry with a blast of energy that knocks back the Resistance group threatening Asahi. I guess the question is, was that magic or magitek? If Zenos was a Resonant then, that would predate Krile's kidnapping by quite some time.
(Pure speculation) - Since Varis speaks so dismissively about him, I also wondered if Zenos' participation in the Resonant project was voluntary. Does Varis despise Zenos because of what he has done to himself, or did he have so little regard for his son that he had him experimented on and is simply less than happy with the results?