Help me understand the genes at work in my flock?

[Floof]

I’ve heard that splashes should not be bred together because their offspring will be lighter than the parents. This chart seems to agree with that. I would breed your splashes back to a blue or black ameraucana. View attachment 3277049

This particular rooster is used for making blue sex links and just happens to also run with my old blue ameraucana girl and 2 splash girls. He does successfully make blue sex links so I know he carries the blue gene but was not sure if he also harbors white