We are not told how Ahah finds a way to regain the throne for his clan, but he does. Moroni is giving us fewer and fewer details, because the pattern is clearly emerging, and all we will need is the most terse of details to flesh out Moroni’s meaning. Unfortunately for us, we want to know more than that.
Chronology: The average-reign chronology places Seth at 380-350 B.C. with Ahah reigning from 350-320 B.C.