I got them from a local breeder, so no worries about hatcheries for me. I can't keep all 8 right up till laying, but I'm assuming things like blue eggs, etc, would all breed true no matter what color Ameraucanas you mix. I could be totally wrong on this one. I'm pretty certain bird color has no influence on egg color, however, so you mysterious "he"'s advice might be best taken with a grain of salt. A white hen can lay a brown egg, and a brown hen can lay a white egg, so it stands to reason that brown or white, Ameraucana would still produce similarly blue eggs.
My slate colored legs are starting to come in on my darker chicks, with the darkest having it on hatch day. All of them show varying degrees of beards and muffs, like little cotton balls stuck to their chins. The wing feathers are showing now, and so far the chicks with red in the fluff are getting a rich brown spotted with black, like flicking a paintbrush style spatter, the darker ones are mostly black with some brown spatter, and the light ones with little red or brown fluff are coming in white/grey, with dark grey spatter.