The one remaining, and crucial, prophecy was that Christ himself would manifest himself to the Nephites. Mormon is now ready to tell that story. He ends his own words and returns to Nephi’s account in the next chapter.
This is the end of a chapter in the 1830 edition. It is fitting that Mormon would make certain to have a division at this point so that the ministry of the Savior might have a structural importance as well as its doctrinal importance.