Jesus christ no. That would make absolutely no sense, especially since we've killed villains for much less than what Zenos has pulled on us. He's not redeemable to the extent you can make him a permanent addition to the heroes roster, because there's not even a hint of a hero in him. His only motivation is the WoL and nothing else, and there's no way to channel that passion into the goals of the scions... which is to say nothing of how not a single one of the scions would even want Zenos there to begin with.

Let's not forget Fordola has only about half the crimes Zenos has and people struggle to accept her. There's no way the murderous crown prince of garlemald would be welcomed in the slightest.

The most they can do, which I'm also partially hoping for, is a temporary uneasy alliance for like 1 level of the MSQ. A period of time where you don't want to work together with Zenos, but have to for some reason, and it's right back to enemies as soon as that's done. I'd love a single Trust instance with Zenos in this vein, but I won't hold my breath on that one.