Any chicks with a pea comb either came from the Easter-egger rooster (assuming he has a pea comb) or a hen with a pea comb, so possibly the Ameraucana hens.
The first chick (blue-gray with orange on its face) and the all black chick must have been fathered by the Easter-egger rooster as a Barred Rock male will always pass barring to all of his offspring and neither of those appear to have barring.
The single-combed chick at the end must have had at least one barred parent to be barred, itself, so either the Barred Rock rooster or a barred hen was a parent.
The yellowish chick must have had at least one parent with a beard as that is a dominant trait, so possibly the Easter-egger rooster if he's bearded or possibly the Ameraucana hens.
Do you know the rest of the breeds that the other person had?