1)
Why does it say "va'Yosef Elihu"?
1.
Rashi citing R. Moshe ha'Darshan: It says "va'Ya'an" three times, corresponding to his three friends. This, the fourth, is called Tosefes.
2.
Ibn Ezra (42:17): Just like you do not understand Hashem's wonders - how, when and why, also His judgments are above you.
