Moroni has a record that gives the prophecies of Ether, but he is not copying them. He is telling them, and using his own vocabulary and concepts to describe them, typically in places where Moroni would recognize the elements from Ether’s prophecy that Moroni had either also seen, or learned of, from the Nephite records. He confirms that this is his process by noting that he was “about to write more.” Moroni confirms that he is making selections from the record available to him.
Turning from the righteousness of Ether, Moroni returns to the more secular history. This story will be told in details that were largely absent in the historical recounting up to this point.
In those turbulent times, Ether removes himself from the places of war, and remains in a safe spot to become the chronicler of the end of his people. The introduction to the end comes in the time when Coriantumr is king (Ether 12:1). Coriantumr doesn’t appear in the genealogy because he is not of that direct lineage.
Significantly, Moroni makes certain to note that at this time of the final destruction, the “secret plans of wickedness” are clearly mentioned as a cause. Although there are other important events in Jaredite history, the one that Mormon emphasized, and the one that Moroni makes certain that is underscored, is the secret combinations. Those combinations are less often called robbers in this text, because the Gadianton Robbers is a name from late in Nephite history. Nevertheless, Mormon, and now Moroni, see them as equivalent, and equivalently harbingers of the destruction of a people.