- Halo 2 Rookie
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- Exalted Mythic Member
Alright, let me explain to you how it was:
Delta Halo:
The Arbiter, Johnson, and Keyes teamed up, and the Elites that surrounded the Control Room all wanted revenge on the Brutes, so they accepted what help the humans could offer in taking down the nigh-invincible chieftain, Tarterus. Noticeably, we don't see if the marines survive, beyond Johnson and Miranda.
Earth:
No news of the Brute betrayel has spread, and probably, won't until Truth contacts the fleet during battle. Which a smart ruler wouldn't do, because that would distract the invading fleet majorly. Therefore, the grunts, elites, and hunters are all still gonna cooperate with the brutes, drones and jackals because they don't know that the elites and brutes are having a civil war.
So while some elites, grunts, and a couple hunters are on the human race's side (at best), most are still united. That'll end a bit quickly, I presume. Especially if the Covenant are able to kill quickly, and the Prophet of Truth can just say "Elites are evil, kill them". And lo, we have battle.