Why does it say "Kisvu"?
Radak: This is a command, like "Re'eh Bni" (Bereishis 27:27), "Solu Solu" (Yeshayah 62:10) and similar verses.
Malbim: Write him in the laws of the Medinah (Bavel).
What is the meaning of "Ariri"?
Radak: If he had children, they will die in his lifetime. If he did not have children, he will not have 1 .
Malbim: Write that it is as if he is Ariri without children; his children have no claim to inherit kingship from their father.
Why does it say "Gever Lo Yitzlach"?
Rashi: This is included in what they should write.
Radak: His entire life 1 he will be in captivity.
Malbim: He will not succeed to be king.
I.e. from when he was captured. (PF)
What is the meaning of "Ki Lo Yitzlach"?
Radak: His seed will not rule in Yehudah 1 .
Malbim: It was written in Bavel's rules that his sons do not inherit kingship in Yechanyah's lifetime. However, after he died, Zerubavel ruled.