The father has a pea comb and the mother has a single comb.
So the chick must have either a pea comb or a single comb.
Based on your picture of the chick, I think it has a pea comb.
There are lots of kinds of chicken combs, and it can certainly get confusing!
As for blue egg genes--one blue egg gene is enough for a hen to lay blue eggs. But some Easter Eggers only have one blue egg gene themselves, so they lay blue eggs. They pass the blue gene to half of their chicks, and the not-blue gene to the other half of their chicks. But having "half" lay blue eggs is just like having "half" of chicks be cockerels: sometimes you get quite a few of one kind!
Plenty of people raise chickens just fine without ever learning about the genetics. But I got interested in genetics some years ago, and I've been learning a bit here and a bit there--over time, it adds up to a lot of pieces of knowledge