SPARTAN GREY 12:about 10 drones could take down a sword elite.
That actually doesn't help your arguement. The Locust are only on one planet, which typically (for Earth anyways) can only sustain around 8-12 billion people/locust.
Now add in the fact that the Covenant are around several solar systems worth of planets....and the Elites probably own a fair portion of this, so there could be anywhere from 20 billion or more Elites.
Now, we'll say that it takes 10 Drones to kill a sword Elite and 4 to kill a regular Elite. That means that there would have to be at least 80 billion Locust to even match the Elites, which there aren't. And not to mention that there are many races in the Covenant, possibly even trillions of Grunts.
The Covenant would win by sheer numbers and technology, and if they can't win then they'll literally tear the planet apart using anti-matter bombs and orbital bombardment.
There is just no way that one, less advanced planet can hold out against an interstellar empire.
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