It is tempting to see the “mighty man” who was a descendant of the brother of Jared as a righteous man because he was of the lineage of that very righteous ancestor. However, this is now a distant ancestor, and history has taught us the sad lesson the righteousness is individual, not inherited. The text tells us that there is a curse on the land because of iniquity. At least twice in the history of this genealogy, the righteousness of a king made up for the unrighteousness of the people and averted the cursing of the land. In this case, the curse is upon the land, and continues. This suggests that this descendant of the brother of Jared was as wicked as the men he replaced.
Chronology: Coriantor would have an overlap from 260 to 240 B.C. He is not in power, and his son will not be in power. This lineage will end in the next generation.