The royal lineage spent six generations in captivity before regaining the kingdom, but Moroni includes absolutely nothing about the actual rulers during these same generations. The genealogy lists only those who should have been kings.
Chronology: Here is a chronology based on calculations of the average reign of these Jaredite non-kings: Heth: 560–530 B.C.; Aaron: 530–500 B.C.; Amnigaddah: 500–470 B.C.; and Corantum: 470–440 B.C.