Moash/Vyre is the Broken One. Imagine a scenario where Dalinar kills Taravangian and the Shard of Odium is left without a Vessel. Because there is no Vessel, Vyres emotions are not held back, and flood back into him. Because he will have so many emotions raging inside him, he becomes the most qualified person on Roshar to be the new Odium. I think he qualifies as the Broken One because in ROW Renarin shows Moash the vision of him as a windrunner. He also shares a connection to Odium