Not really, once you understand it.That blue/black/splash thing is confusing.
Blue is a dilution of black is all.
I have been messing with the Kippenjungle site & came up with this:
Enter a Silver Spangled male and a Blue-Breasted Silver female= 25% blue patterned silver w/incomplete spangling (may have to breed those back to the male)
OR:
Silver Spangled male to Blue Silver Duckwing female.............check that out.
Quite often, what you want just does not happen with the first generation.
You have to keep the best pullets & breed them back to their sire, or best cockerels back to their mother.
Sometimes it takes several generations to get the end result.
I usually bug genetic experts when I want to know for sure the course to take.