Your concern is understandable.
Men have walked on the moon. It is possible that the pullets will lay darker eggs. Without knowing the genetics of the rooster it’s hard to say.
The way egg color genetics work, there is one gene that determines base color, blue or white. If you have brown eggs, that base is white. I’ll go through this little chart just to help explain it.
Base white + no brown = white
Base white + brown = brown
Base blue + no brown = blue
Base blue + brown = green
Then there are a whole lot of genes that determine the shade of brown. Which of those genes are present and how they interact will determine the shade of brown you get. To get a bit technical, I’ve read that there are 13 different genes that affect egg color and a bunch of undocumented genes. With so many different genes involved, it’s no wonder there can be so many different shades of brown. And some of those genes are going to be dominant and have an affect no matter what and some are going to be recessive and will only have an effect if they pair up.
Obviously the hens that laid those eggs are not contributing many dominant genes that give you dark eggs. I have no idea what recessives she may be contributing. I have no idea what the rooster is contributing. It’s possible some or all of the pullets from your hatch will lay darker eggs. It’s possible they won’t. The only way to truly tell is to see the eggs those pullets lay.
But yes, if those eggs are light, I would not be real happy at this point.