What do we learn from "Edro"?
Malbim: When a shepherd investigates his own flock, he oversees them well.
What are "Nifrashos"?
Rashi: They are scattered. [The shepherd] goes among them and gathers them together.
Radak: It is like Nifrados (separated). Then, [the shepherd] investigates them well.
Why does it mention a cloudy dark day?
Rashi: It is normal for the flock to scatter on a cloudy day. Malbim ? on such a day, he investigates immediately to know their number and happenings. So I will peruse My flock and save them from all the places they scattered to, due to blindness of the leaders and subjects on the day of Galus and killing.
Radak: Galus was a dark day for you.
