> Elites would’ve been a maybe. By 2557-2558, there’s a lot of tension between Humans and Sangheili, considering most of the latter wants to eliminate humans before they recover, while the rest of them just want to rebuild their culture and whatnot; some even want to form a treaty with humans, though these are the minority. So, with that it mind, it would be extremely unlikely that any Elite, save for the Arbiter and perhaps some of his personal guards, would be permitted to set foot on the Infinity in the forseeable future. And besides that, the player models would be too big… maybe. I think Halo 3-era and Halo: Reach-era Elites were the same size, only with the former hunched over for gameplay reasons… if 343i could do that again, it would probably work. If nothing else, Elite lovers would be happy.
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> With Brutes, it’ll never happen. Most of them are either rogues or servants to the Elites, though there are some pirates who work with the Insurrection, or at least outside the law. As far as I know, there are Brutes, Jackals, Skirmishers, and Grunts that fit this category.
You have the story slightly reversed, over “sympathizing” humanity. Parangoski, Oni, and a large populations of Humans are actually the ones who want to wipe the Elites out, not the other way around. Sure some Elites still believe humans are heretics and need to be destroyed. But most of them, including Jul 'Mdama, are actually mounting up defensively against humanity, not offensively.
In Parangoski’s own words she described that she wants to wipe Elites out and make way for human colonization of Sangheilios, when explaining why she did not want to chemically poison the Elite population using their crops, because it would leave the planet unfit for human life. Even Admiral Hood is letting Oni get away with attempted genocide, ‘turning a blind eye’, and only showing a face of peace to the Elites to keep appearances.
To be perfectly honest, humanity is slowly turning into the bad guys. If you look at some of the lore from a less patriotic standpoint, you’ll see that the Didact was actually right to be worried of what would happen if Humanity attained the Mantle. Humanity the way they are now would use that power to wipe out all sentient non-human life in the galaxy save maybe the Huragok.
It is clearly defined on several occasions in the Kilo-5 trilogy that Jul 'Mdama doesn’t hate humanity. He is only concerned with protecting his own people.
And all that aside. Infinity “Canon” Multiplayer is redundant and pointless. We don’t need it, and the game would be better off without it.