By the power of truth, I, while living, have conquered the universe.
Posted by: JobeTheConqueror
You're writing in the past-tense, making the events sound like the home planets are no more. Also, you're phasing out the timeline, going from Reach to Halo 3, it's confusing.
The San 'Shyuum's homeworld was destroyed by a supernova and when the Reformists left the planet in the Dreadnaught, it took a massive chunk out of it too. That happened centuries before the events we play and many years before the Covenant was formed.
Doisac (the Jiralhanae world) is only primitive and is a minority at the end of Halo 3. The Humans and Sangheili don't seek revenge to the extent of genocide.
Balaho and Eyan along with the other Covenant worlds weren't involved in the war much because they were too far away from Human travel space and probably had masses of Assault Carriers or native defences en guard.
The races were enslaved, their planets weren't destroyed.