1)
What is the meaning of "Tov Olelos Efrayim mi'Vetzir Avi'ezer"?
1.
Rashi: Olelos Efrayim hints to Efrayim finishing [the defeat of Midyan, just like Olelos remain at the end of the grape harvest. Betzir Avi'ezer hints to the start [of the war through me and my family. Radak - Gid'on killed many from Midyan.] The former is better, for you captured the kings.
2.
Radak: It is a metaphor. The smallest of you are better than the greatest of us.
3.
Radak citing Targum Yonasan: The weak of Beis Efrayim are better than the strong of Beis Avi'ezer.
