Statements regarding the comics reboot:
"I have a question regarding the new Alien-Predator universe which Dark Horse is creating. Is this a whole separate and new universe from the already established twenty five years of lore which was started from the late 1980s to 2009 or does this completely override the old lore?"
"The old Dark Horse comics series about Aliens, Predators and Aliens fighting Predators never came up in the writer's room as we're working off a different angle of the universe, one that may touch on some of the stuff those old books did, but only by accident. But we're not declaring all that stuff moot or rebooting it or anything, it's just two different neighborhoods in a pretty big city."
This means that, according to the official word of the comic writers, the Engineers from the EU are in the same universe as the Prometheus variants. They're just different designs/versions. I wonder if the AVPR version is a skull of one of the Engineers from the comics or a helmet of the Engineers from the movies.
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I don't think that canon is really as defined in this universe as Andrew would like us to believe.
Andrew seems pretty confused on quite a lot of things, to be honest. For instance, they don't think The Predator is the same universe as AVP despite the fact that the movie has Lex's Xenomorph spear, they wanted Yutani from AVPR to return, and they wanted to introduce a time travel element bringing in an alternate timeline Ellen Ripley or Newt.
As long as Marvel doesn't contradict things too badly, I guess it's fine. The Predator stories don't seem to care much for Hunting Grounds, but I think it's fair to ignore the idea that the only encounters the OWLF had were 1987, 1997 and 2018. Maybe major encounters, sure.
I do think the canon of those stories are more fluid though.
As for the 1715 pistol, we can BS it. In 1718, Raphael Adolini died and gave it to Greyback. Greyback lost it and it was acquired by "Raphael Adolini" (except he's just a random guy). It came into the possession of Naru in 1719 after the previous owner was killed by the Feral Predator. Then, Greyback came for it at the end of the film. This or there's two characters named Raphael Adolini with the same pistol, or the 1718 version is just completely unrelated and the pistol is a retconned element. Whatever, but Dark Horse would have totally bullshit their way into both being canon like they did with Alien³ and Alien: Resurrection contradictions, lol.
Hunting Grounds is pretty consistent with the EU canon. Dutch was healed using Predator blood and now has enhanced senses and lifespan, just like AVP: Eternal and Predator: Xenogenesis show.