The EEs from hatcheries are not the same as non standard AMs. Many of them are from an import of Quechas. They were imported several times in the last Century.
Some call them improved Quechas.
Ok gotcha.
Since you know so much about breeding and genetics and such, I have a question. The chicks that were born looking like a barred rock (some with yellow head spots, some without), are those specific ones sexlink? Even though a bunch of the chicks hatched out looking like chipmunks, and some yellow?