1)
What is the meaning of "Eschabar"?
1.
Redak: He joined. It is like Hischabar - the Aleph is in place of a Hei. Also Eg'alti is like Hig'alti.
2)
Why does it say "Hu Hirshi'a"?
1.
Malbim: He himself chose to be evil, unlike Achav, whose wife Izevel enticed him to evil.


