Quote Originally Posted by Faust1105 View Post
I will mention 2 other points in support of him returning...

Even though it was back in Stormblood, his mention of binding with a primal is of great note. Until Endwalker, when we basically realize that we have been serving a primal all along, we saw primals as a threat to the world and sought to eliminate them. Now we are using them to help us, and his knowledge of binding them for our bidding, I believe could come in handy down the road.

Also his fabricated Echo has not been put to full use. We've got a couple of soldiers running around with it, as well as Zenos himself, but being the master-mind behind it all, it would be a shame for him to die off before it comes to full fruition.
I think Zenos is a full on Ascian at this point, at least according to several characters, and they can’t be killed without white auracite. Instead of killing him using this, i’d much rather put his talent/strength to good use