Read the feed label. What are the %s for protein and fat? There is a wide range of chicken feed out there for different life stages so if you're using a 15% protein "grower" rather than a 20% starter, that would be a problem. Next, read the date stamp on the seam to be sure it isn't stale or...
I'd advertise them as pet quality just to avoid anyone complaining later. If you're seriously considering getting into breeding, though, I'd get stock from a breeder. They'll cost a little more but you will be starting with fewer faults to correct. And you really don't want to use a single comb...
EEs from hatcheries are not crosses but rather descendants of the original landrace stock. And they are often chipmunks but not always.
I don't have the old pictures handy but I had two that looked a good bit alike as chicks. Typical chipmunk markings in slightly different hues. One ended up...
I can't tell if it's wet feathers or saddles emerging. I just grab the ones that I'm concerned about and look at the saddle area feathers. It's a lot easier to see the shape that way. But, I'm leaning female by the consistent color on the wing, body shape, and age.
Agreed, mixed breed cockerel with a good dose of Silkie in there. The parents were likely barnyard mixes too (note the single comb) so no telling what all might be in there.
I must be a horrible person because my first thought was that if the yard is already fenced, why not get a dog? I'd expect that would discourage peafowl trespassing.