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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I suppose that you can come up with stuff like that to fix the cannon, but these points are a little harder: 1. Why is Chief's armor different? Did Cortana modify it while he was in the cryo tube? 2. How about the guns and UNSC logo before the Infinity arrived. Unless the Dawn was carrying them before she got stranded, I don't see how Chief could have gotten them(and no, Cortana can't just change the appearance of all the equipment on the ship.