The Jaredite king-line spends 6 generations in captivity before it is able to regain the kingdom. We have absolutely nothing about this alternate lineage. What we get in the Jaredite king-list is the genealogy of those who should have been kings, and we miss the entire history of those who were seen as interlopers to the throne.
Chronology: The following would be the average reign dating for the overlap in the lives of these Jaredite non-kings:
Heth: 560-530 B.C.
Aaron: 530-500 B.C.
Amnigaddah: 500-470 B.C.
Corantum: 470-440 B.C.