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The one at the top (1st pic) looks Gold or Golden, the one in the middle looks Silver. Since you said he was the yellow chick, that means the top chick, and he could be Gold or Golden based, which means ...
GENETICS - SKIP OVER FUR N FEATHERS:
Chick down shows the Gold/Silver bases better than adult feathers. It also can show the color base better which you will not see once they get their adult feathers. The modifiers come into play when the chick down disappears, and it changes again and again through the juvenile molts until the adult feathers. Some people talk about black chicks being black and yellow or black and white when they are babies. The black and white ones are silver based, the black and yellow ones are gold based. When they get older they become all black birds with no base showing, except the gold based ones have really good green sheen to their black feathers. If you are doing blacks, you want gold bases for the green sheen. If you are doing whites, you want silver bases for the whitest whites and NO gold leakage (because they are silver the silver leakage doesn't always show). As they get older the modifiers can loose their potency too - so you will find some male birds starting to show leakage as they age if the color was covered by a modifier.
If he is Gold he carries two Gold genes. If he is Golden he carries both Gold and Silver genes. His sister was Silver (she only received, carries and gives one gene to her kids, its sex linked), so I suspect he may be Golden. He looks Blue right now -but he shows the male patch red which is a modifier of Gold, which is why I suspected he carried Gold. He may get more yellow/gold feathers on his neck and saddle as he gets older. He may also get more Partridge markings which would make him a Blue Partridge. If he does not get any more Partridge markings then he would be Blue with red leakage. He might work in a Partridge pen to produce Blue Partridge chicks, he is half way there. I would not put him in a Black/Blue/Splash pen because the red/gold leakage is not wanted in that breeding. Pretty much the only color where that red is wanted is Partridge - or true Red Silkies, but I have never seen a true Red Silkie, only dark buffs with red leakage (I have one boy like that).
I hope you are enjoying playing with the color calculator!