Verses 16 and 17 quote Micah 5:8 and 9.
The gathering is yet in the future; the time had not yet come that the Gentiles would scatter this people. However, there will still be a continuation of the blessings upon the house of Jacob. The Gentiles might, at some point, scatter Jehovah’s people (and it was prophesied that that would happen to this people), nevertheless there will come a time of reversal, where the house of Israel will be dominant. Israel will be able to defend herself against her enemies.