So I finally did the reaper job quests and I found something a little interesting. It's kind of a spoiler but it's not really that critical tbh. I think you might enjoy it.
The main quest NPC, Drusilla, almost gets killed by the main antagonist of the questline, an evil voidsent but she survives because of her avatar/its soul. He tries to kill her AGAIN and she is basically dead, laying there lifeless, but then she survives once again saying "You didn't finish the job." I think we can apply to this Zenos for sure. I'm actually baffled about how powerful he is (nearly a full on Ascian, reaper with a voidsent which apparently can make reapers almost immortal, can turn into Shinryu lol) that at this point I'm extremely skeptical he's dead. With him being in that realm of hope, if/when he wakes up, maybe he'll wish to be back home? Like he wished the WoL back to the Scions. Then we get our long awaited redemption arc. <3
Also when you talk to Drusilla about reapers, she seems to know a lot about the Thirteenth shard. And mentions souls (forgot what she said exactly) I'm almost 100% sure Zenos's avatar is Azem's shard on the Thirteenth.