I think our choice will be who gets to kill Mah. Kharshai is also trying to avoid being sacrificed in the emergency ritual, and the BTS says that he's the one who sends us to how we eventually view the memories of the betrayal, though I'm not sure why he would be interested in that information here.
Azzanadra being utterly devoted to Zaros actually does have a point, as he's meant to serve as source of post-quest dialogue in the Elder God pillar, which is why we have the blank observation. As long as Zaros has a role in the Elder God pillar, so does Azzanadra, since he's supposed to find the Elder Halls.
Hazeelsaid: And Char's supposed to be tracking Sliske while Nex "contains the war"....yeah, this means nothing. And honestly, we should be the ones to find it. And if post quest dialogue makes a character immune to death, I suppose Zamorak and Zaros can't die, neither can Bilrach, or Veldaban--wait...
My point is that the post-quest dialogue is part of an ongoing story. True, Char is doing nothing even though you would think she'd be interested in the Siphon after Kindred Spirits, and Nex trying to contain certain forces means nothing now that there's a completely new God Wars Dungeon, but every option in the Elder Gods poll included the note that Azzanadra would receive post-quest content. That said, I don't expect Azzanadra's role to amount to much beyond something like what we get with Degquest.