Yay - so glad that you are involved with CLs - and congratulations on having so many chicks to choose from.
You may be onto something with careful looks at the chipmunk stripes. In her book genetics expert Sigrid Van Dort says that the stripe can tell you what the underlying e-Locus IS -- so if the stripe is white-- that is a silver e-Locus - if the stripe is brown it is a gold e-Locus -- (cream wasn't mentioned)---- If the theory applies -- perhaps a cream-coloured chipmunk stripe (the lightest one on the back of the chick) indicates a cream, ETA -->perhaps the center dorsal stripe indicates the amount of black pigment - melanotic -- opps sorry if I misspelled that...
I had a chick with very white underbelly and chin - and she feathered to a very melanotic (black pigment) adult - although her breast didn't have the dark feather edges that we are seeing a lot of now-a-days. She had lots of black in her neck-hackles. Most of my chicks are very cream on their underbelly and fuzzy-butt.
Just as chicken pickin says, the longer you can keep them the more you will know....but down and adult color -- I haven't seen anyone with the definitive answer about the correlation as of yet. Email those phone pictures to your email -- and grab them from there to post. (it's a thought anyway!)
I wish so much of my mind hadn't gotten stolen away as my age keeps advancing.
You see, it that hadn't happened I would be able to remember which chick is who by color,markings etc. Since this last group of chicks is the largest group and still in the regular portion of my house I am trying to study them more. I did learn on here about looking at the straightness or not of the combs. I'm wanting to mark the ones I like best before I put them with any others. It seems once they loose their chick down and get a lot of feathers when there are so many looking the same I can't keep them apart in my mind.
I need to really go over these and band (make a written list too) the better females as far as eye stripes and bodies with a color and also band the ones that don't have the best defined markings.
Come to think of it when I bred rabbits I was much younger and tried to never have 2 of the same color, breed, or sex because I didn't want to make a mistake in my breeding. At least if push came to shove I tattooed the rabbit's ear. Goodness, guess I was a lost cause with identity even then. I think I will blame that on too many responsibilities.
I just don't understand chick down very much. A few years ago I bought day old Marans in the blue,black,splash. They seemed to be good about chick down to adult color. Now I have one Marans chick that I bought as a blue copper but when it came it looked very different. No white anywhere. A little bit of brown on it's face but to me the chick looked black...not blue. It may be a very dark almost black blue which I've never had.