I wouldnt be surprised if they were bought out by a commercial egg company if they had the motive to sell blue eggs. The U of Ark just scrapped what they had, from my understanding the creator is still working with them.
You might have missed the first graphic because the first cross that is shown up there has a Heterozygous hen and a homozygous recessive male.... So Elias's first cross would have been accurate, and then if he had taken a leghorn roosters over the resulting hens then you would get the first...
Such as Hy-Line W-36 which is what McMurray Hatchery sells as leghorns from my understanding. Also, I have a friend that has purchased birds from Hy-Line hatchery also. Even if the creator used the parent stock, I dont think using the hybrid offspring would set you back very far at all... you...
One thing you should remember though is that the Blue Egg gene and the Pea Comb gene are linked genes so it would be easier to keep the Blue eggs if you would keep the pea combed birds, though you can get a SC bird laying blue eggs. Also, it might be easier and cheaper if you find a tailed...