1)
Why does it need to say that the Mizbe'ach tore like the Mofes that the Navi said in Hashem's name?
1.
Malbim (4-5): This excludes the drying of Yaravam's arm. There was no Nevu'ah about this; it was a punishment for the Navi's honor. Therefore, Tefilah could help to undo it.