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What speckled hen said... You could never get to a delaware with that cross.
The standards for establishment of a breed are pretty well defined. You have to have bred for generations, have a written standard, have enough people breeding true to type birds, that then begin to show them, establishing type and breed knowledge, if the breeding pool is big enough, if enough people help out, if they breed true to type, if they show, if you develop a working written standard. Then yep can be done. Many people here are showing Marans to get the breed accepted into the APA. There are many people working with non-APA breeds to bring them into the APA.
One person can't really do it, since there has to be interest in holding the breed and promoting it, for a breed to become established.
You can breed a true to type hybrid that people may recognize and buy but it won't ever be a real breed until it is recognized.
Like some of the off colored Rocks I'll be breeding - unless other people pick up the color, breed it and show it, it would never be anything other than an off color.
If I add in Dels for size, then I have to spend generations getting the off characteristics back out of my lines. I have to get back to birds breeding true to the standard before they are purebred again. And that for a couple generations at least.
As to getting Delaware pattern by breeding random breeds together - not gonna happen. It's a sport. It's an uncontrollable fluke of nature.
And owning more than a dozen of them - it's a bit of a freak of nature as well, they're demented popcorn chickens.