Mormon has been quoting from the document Mosiah sent to be read to the people. Now he summarizes. Apparently, Mosiah felt that the greatest need was to justify the change; therefore, he provided even more discussion of why it could be disadvantageous to have a king. Both the Nephites and Zarahemlaites had kings from their beginning, and the shift was a major change in the way the people thought. Thus, it was probable that multiple arguments were required. Mormon lived long after the change, and did not see the need for further discussion of those problems. Therefore, he summarized, rather than quoted, that part of the document.