What does the verse teach about these Leviyim?
Rashi: They were the head of the Batei Av of the Mishmaros of Leviyim in the days of Elyashiv Kohen Gadol. The Kohanim listed above headed their Mishmaros also in the days of Elyashiv.
Malbim: In the days of Yoyakim, the heads of the Kohanim changed, but not the heads of the Leviyim, for most of the Leviyim ascended only in the days of Ezra shortly beforehand, but not earlier with Zerubavel. The heads of the Leviyim changed in the days of Elyashiv.
Why does it say "Kesuvim Roshei Avos"?
Malbim: They are written elsewhere.
What do we learn from "Al Malchus Daryavesh"?
Rashi: This was in the days of Daryavesh. His reign extended from Elyashiv until Yadu'a; Shimon ha'Tzadik was Kohen Gadol in the days of Malchus Yavan. The Kohanim who changed in this time are written.
