I recall seeing photos of you having splash cuckoos, do you have blues too? (girls) The splashes do indeed hatch out almost white, then grow up to be slightly darker due to the (sort of) barring.
The less you breed to splash, the more you'll end up with darker birds. The parent birds to my parent birds (Gary Ramey's) are actually quite a nice blue cuckoo, but because his main cock is a splash, the offspring vary from normal to light blue. Thus, the cuckoo patterning can be pretty faint, too, like on my cock. However my blue hen is a decent blue, and has decent patterning.
Splash cuckoo chick
Darker splash cuckoo chick, easily recognized from normal splash by the prolific dot on the head (in this case the dot is yellow)
Blue cuckoo chick; male, easily recognized by very large, irregular yellow dot on head expanding to neck
Blue cuckoo female
The less you breed to splash, the more you'll end up with darker birds. The parent birds to my parent birds (Gary Ramey's) are actually quite a nice blue cuckoo, but because his main cock is a splash, the offspring vary from normal to light blue. Thus, the cuckoo patterning can be pretty faint, too, like on my cock. However my blue hen is a decent blue, and has decent patterning.
Splash cuckoo chick

Darker splash cuckoo chick, easily recognized from normal splash by the prolific dot on the head (in this case the dot is yellow)

Blue cuckoo chick; male, easily recognized by very large, irregular yellow dot on head expanding to neck

Blue cuckoo female
