Redaction: Moroni gives us an ending. Very clearly this is a farewell, both to future generations of the Gentiles, and future Lamanites (my brethren whom I love.) Obviously, however, he is not finished with Ether. Why this final statement if he has more to write?
Moroni is doing two things simultaneously in Ether. He is giving us the story of Ether, and he is giving us the moral of Ether. There is still more story, but here Moroni will end the overt detailing of the moral. Moroni gives a conclusion because this ends Moroni’s part of what he wants to write that is based on the plates of Ether.