I honestly thought it was Jakarra at first as well. But then I didn't know if Evan had the testicular fortitude to retcon Kirby of all people.
These past stories are always tricky because Evan is trying to mix together multiple origins while telling a story that can't upset the known previous stories. Retconning a large chunk of Hudlin's story is one thing because it was supposed to be non canon anyway. But right now, Evan is playing with fire because he is working with Killmonger (Panther's Rage is very well known) and Hunter (Priest).
He has already retconned Killmonger's origin, which was an odd decision IMO. Having Killmonger being exiled because of his father's mistakes gives him a much more compelling reason to hate T'challa with all his being. So, in two issues, Evan has to give us a reason for Killmonger to hate T'challa as much as he does. Killmonger being part of the Hyena tribe doesn't make sense at this point in the story as he seems genuine at this point. It would be one hell of a, "I plotted from American for revenge!" type of thing if he went that route.
Jakarra's is the easiest for Evan to play with because he is more of a clean slate... if Evan is willing to retcon Kirby's story out of existence. IF Jakarra is the one that basically commented treason... how does Jakarra end up as a Wakanda general (if I am remembering correctly) ala Kirby's story? It simply wouldn't make much sense. But, as I mentioned elsewhere, Evan bringing this up....
is a way to explain Jakarra's existence. There is no reason, IMO, for Evan to show T'chaka banging chicks in grief if ti wasn't for some reason to explain why we have no idea who Jakarra is and why he is never talked about ever.
Hunter is the easiest to use of course since he has such a twisted version of "Wakanda Pride."
One theme that has me curious is Evan's keeps bringing up "Challenge Day" and how it is soon-ish. Is Killmonger going to take part in it? It would be interesting if Killmonger does, gets curbstomped by the enhanced T'challa, and that causes him to head out into Wakanda to find someway to enhance himself. We still don't really know how Killmonger got so damn strong.... he just shows up in Panther's Rage looking fly and jacked on Tren.