Thatoneguy

I'm new to the website and can't find this question so I thought I'd ask: (spoilers for book three I believe) As I understand it, Odium came to Roshar from Braize with the humans. Honor and Cultivation and the Listeners were all natives of Roshar. So why did Honor/Cultivation back the humans? Also, I get that the ancient Listeners tied to Odium would go back to Braize in death, but why don't the humans go there as well if they were the original connection? Did they just decide as a people to fully swap gods? Final question, why did Honor/Cultivation decide to share a planet? I get the reasoning behind Ruin/Preservation, but I feel they dont need eachother to form their own worlds.