1 Kelpien in 1 craft? That does not add up to genocide. The Ba'ul were xenophobic, so I doubt they wanted to make the trip to help non-natives, especially the ones who messed up their whole balance of power. But it's nice that you're on their side.So what... Did the Kelpians genocide the Ba'ul?
Because that's the only way I could see them getting Ba'ul ships given the political climate of the planet when Discovery left.