Am I the only one here who thinks there's a logical explanation for every deviation from the mainstream universe, because some days it awfully feels like it. While I realize 343 had to take some artistic liberties when they were designing Halo 4, I personally believe there is a logical explanation for everything they did... well, mostly everything.
My own headcanon suggests that the Jackals in Halo 4 belong to a subspecies of Jackal I would call [b]Monitors[/b], who were simply Jackals who went down a different evolutionary path than the common Jackal (the subspecies I dub the [b]Vulture[/b]). Monitor Sniper helmets are different because Monitors don't have the elongated snout of the Vultures.
Stuff like that. So, do you think there's an explanation for everything?
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Grunt those were the most recent graphical adaptations of the races in which each installment was what they looked like. above-- They never did explain that(bungie, rolls eyes) It was just a firmware update his armor is a graphical update exactly.