My theory is he's going to become the "brains" of this opposing group, and Calyx will likely be obsessively researching us now that we made him see what ever an Endless' version of Jesus is.

Now that I say that, I actually hope the Winterers actually work as a team verses the Ascians, who spread themselves very thin and rarely worked in tandem. If these Winterers actually relied and supported eachother as allies, they'd make for a vastly more dangerous force.