These final verses repeat the idea that they traveled trying to teach what they had learned (first seen in verse 32). The difference is that the first occasion was only clear about Alma the Younger. In these verses, the four sons of Mosiah are explicitly added to the body of those who travel about.
Textual: These verses conclude a chapter in the 1830 edition, and therefore a concept. Mormon closes out his record of this transformation be clearly including the most notable participants by name. Alma the Younger, Ammon, Aaron, Omner, and Himni all preach the word. Where the earlier discussion of Alma the Younger’s mission also included a note that they were persecuted for doing so, this final conclusion leaves that detail out. Mormon elects to leave the story on the most positive level. These men who began by denying the Lord, now actively declare him.