Halo: Reach vehicles and weapon designs are not redundant; as they were not decommissioned but improved upon… so Halo 3 Models and Halo: Reach would all be canon post Human-Covenant War…
In terms of Halo 3 models… I think 343 Industries have heard a lot about this issue… they have shown that after the events of the Second Requiem Campaign (Spartan Ops) that the older designs still exist… in Halo: Escalation.
Issue #1 re-introduces Covenant armour variants… from Halo 3 and Halo 4/Halo: Reach.
Perhaps 343 Industries wanted to differentiate the two Covenant factions… to show that each faction has a certain set of beliefs, lifestyle, code of conduct etc… They could be foreshadowing:
That one faction, the Separatist Elites, still believe in peace with Humanity, post Halo 3; through relative looks, that gives players the sense that, these were the Elites that we had fought with on the Ark and Earth, and made peace with…
And the other faction, the Storm Covenant, are a new and independent Covenant, which don’t believe that Humans and Sangheili, can co-exist peacefully, but still see the Forerunners and their artifacts, as sacred. The Sangheili in this Covenant still believe in the Forerunners, perhaps due to the fact that they didn’t hear of the Jiralhanae’s genocide, or of the Prophets lies; and so would have continued to follow the teachings of the Great Journey. They would have a harder time adjusting… to peace with Humans, upon finding out; plus the other species; grunts and hunters could be those that were part of the loyalist faction, that fled without a leading role or directing motive, and so were lost, and the Jackals could have returned to their pirate or mercenary ways…
The unnamed Jiralhanae Clan are shown wearing power armour from the Human-Covenant War. This probably is to show that the Brutes are not as technological advanced, as other species, and that they utilize what is given to them, but cannot improve on it.
Issue #1 and Issue #2 re-introduces vehicle variants… from Halo 3 and Halo 4/Halo: Reach.
343 Industries could be trying to show that the Storm Covenant forces are salvaging all assets, whether they are of older models… this is due to the fact they have limited engineers, and no prophets, to direct their technological repairs.
The Jiralhanae clans are also seen utilize old vehicles, seen in Halo 3.
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The Separatist Elites are mostly from Sanghelios, they are shown to be wearing different Sangheili harnesses, to those possessed by their Hesduros cousins, in the Storm Covenant; with the exception of the Arbiter, Kaidon Thel’Vadam.
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Elite Assault (Halo 3)
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Ascetic Elite (Halo 3)
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Combat Elite (Halo 3)
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The Storm Covenant are shown wearing the same, or similar, variants, to those seen in Halo 4 and Halo: Reach; with the exception of unique heroes… like Supreme Commander Jul’Mdama and Shipmaster Gajat.
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Elite Zealot (Halo 4)
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Elite Warrior (Halo 4)
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Storm Elite (Halo 4)
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Skirmisher Champion (Halo: Reach)
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Hunter (Halo 4)
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Jackal Sniper (Halo 4)
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Jackal Ranger (Halo 4
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Storm Jackal (Halo 4)
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Storm Grunt (Halo 4)
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The unnamed Jiralhanae Clan uses armour that is very similar, in design, to that of Halo 3 Brutes, with the exception of the Eldar Brute Chieftain, Lydus.
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Brute Captain Ultra/Brute Bodyguard (Halo 3)
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Brute Captain Major/Brute Bodyguard (Halo 3)
The vehicles that are seen in Halo: Escalation are: