Two sides is indeed the essence.
But are they fighting purely because ot the Dark Siders? You are fighting thousands at once here and not one of them in sight. Did Kuylen's agents personally convert all of these people? No more than you personally converted all of yours.
It's actually very simple. Why are these people fighting? Why are they flocking to your banner so fast?
"We haven't encountered even one of Kuylen's thugs, let alone Kuylen himself," Kellan pointed out. "Yet here are masses of Zeitonians fighting each other to the death . All apparently capable of manipulating the Force in some fashion or another...bent on destroying themselves..." she buried her face in her hands, her mind trying to piece it all together.
Tpt and Kosta have it!
All the people that joined your side are Good- none of them want to hurt unless necessary and are fighting only in defence of their planet.
All the people that joined the other side are Evil- they are all selfishly trying to gain power and do not care what they destroy on the way.
And to put it in SW terms as Kosta just did, your guys are all Light Siders, theirs are all Dark.
Now, that might sound criminally obvious but there is something very important about this, that the whole story since you arrived on Zeiton has been suggesting, that has been missed0 and has given Gundark her bad feeling.
They aren't fighting for you, or Kuylen. Most of them haven't met either. They just know OF you. SO what is going on here?