1)
Why does it say "Sa Kinah El..."?
1.
Radak: "El" is like Al; there are many such verses.
2)
Who are "Nesi'ei Yisrael"?
1.
Rashi (3): They are Bnei Yoshiyah. Malbim - until verse 9 discusses Yeho'achaz, Yehoyachin and Yehoyakim; from verse 9 discusses Tzidkiyah.
2.
Radak: They are Malchei Yehudah - Yeho'achaz, Yehoyakim and Tzidkiyah.
