1)
Did Binyamin come to discuss what happened?
1.
Radak: No. The verse interrupts to say that they heard that Yisrael gathered, but they did not come in front of them to [join with them to] eradicate the evil.
2)
Who spoke to whom?
1.
Radak: The Pinos (leaders) told Bnei Yisrael to say what happened.
3)
Did they not already know what happened?
1.
Malbim: They had heard from Sheluchim who brought the limbs to each Shevet, but they needed to hear details. If it was only individuals, and she died from Bi'ah or the cold, Yisrael would not fight about this.
