I would not put a whole lot of faith in that pretty chart. I've seen it before, I'm not sure who made it up, but not someone with a deep understanding of egg color genetics. When you take a disparate cross like this and breed for varied outcome as a goal, the end result would be considered a "barnyard mix" by most people. Easter Eggers from hatcheries fall into this category. I like being able to say with certainty what color egg a chick will lay (and also that it will lay eggs and not end up crowing). Knowing at least those 2 traits makes a chick very desirable. It's nice to be able to say if it will have dark legs, or muffs, or a crest, but the egg color and gender are key.
I have seen claims of autosexing olive eggers that breed true for olive eggs. That is not an unattainable goal, but developing a line if chickens that consistently lays olive eggs is a lot harder than it sounds because both the blue egg and brown egg genes are dominant, meaning they hide the non-blue (white) very effectively. Dominant egg colors are extra hard to fix because you can't tell how many copies a male has (they could have none, how would you know since they will never lay an egg). The only way to be sure you have homozygous blue male (needed to get all olive egg laying daughters) is to do test matings to a non-blue egg laying hen and raise all the pullets to point of lay. If any lay brown (or white) eggs instead of olive, the rooster is heterozygous and not what you want. It could take years, and hundreds of chicks being raised and evaluated, before you could prove you had the real deal, and getting a proven homozygous hen is nearly as much work, you also have to do test matings with her to a white egg laying breed roo and see if any chicks lay white eggs. So call me skeptical about the people claiming to have lines of true breeding autosexing olive eggers.
OTOH, I can guarantee that the F1 of a Legbar x Welbar will lay olive eggs and will be 100% autosexing. Future generations will produce some olive eggs and some brown eggs, but you will never be able to tell by looking at the chick what color egg you will get. They would be autosexing Easter Eggers, not a bad thing perhaps, but not what I'm looking to produce when for the same effort I can produce 100% olive egger pullets.
I'm not trying to put down anyone's efforts to make hybrids and enjoy the results, I'm just trying to explain why I don't breed toward those goals. I look forward to a not -to-distant future when I can send a blood sample from a bird to get a DNA profile that can tell me exactly what the genotype is. That would make the huge problem I described above be reduced to a very simple genetic screening to find the right 2 birds to pair up.
What I did to create Welbars was far easier because I was only concerned about genes that were recessive or partially dominant, so it was easy to tell the genotype of the birds in each step.
Sorry if all that is confusing. I know not everyone is as "into" the genetics of chickens as I am.
