Hi Nicole,
Chicks change so much as they mature. That is half the fun. I have one blue hen, who looked barred as a chick, but her mature feathers show no barring. She doesn't have show quality color though. I have never seen another blue Ameraucana with barred feathers. Most of my blue chicks show good dark edging, kind of outlining the the feather, and you want this. In fact one of the members on this thread is working on a breeding project to improve the lacing (the dark rim around blue feathers). I am going towards an all black flock, because my blues don't have the correct lacing. It will be easier to for me at this point to just work on having nice blacks.
It was my pullets we were talking about the beards showing come red color, and they didn't have leakage, just high lights from to much sun.
I raise my flock organically and free range, so some fading of feathers in the sun is not surprising. I would rather live with a bit of sun damage than stop free ranging my birds. My young rooster has leakage in his hackles, but they just started showing up this month, and he hatched in Feb, it really does take a long time.
I only thin my chicks out at that stage of the ones you have pictured based on size and sex. I once read an article that said that you could improve the growth rate and size of you flock by only selecting the chicks with the biggest bone structure. The article went on to say that when they are little, you select them by how fat their heads are. The fatter the head the bigger boned and faster growing the chicks will be. So I look for fat heads (I am breeding for more growth) and look for 3 rows of dots in the combs (this always means boy). So I only cull early for small bone structured boys, because my luck has always been to hatch more boys than girls, and I am afraid I will inadvertently cull all my pullets.