“the scattered children” = Caiaphas’ words are not enough and John amplifies what God was saying through that prophesy. The “scattered children,” if spoken by a Jew, would normally be taken to be the Jews of the Dispersion, but here it is meant to be all of God’s children, including the Gentiles (Gal 3:28, Col 3:11). Morris notes that “Sin scatters men, but salvation in Christ brings them together.”

Galatians 3:28  There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus.

Colossians 3:11  Here there is no Greek or Jew, circumcised or uncircumcised, barbarian, Scythian, slave or free, but Christ is all, and is in all.