I should probably list off all te breeds hes got.
Bard rock roo
Rode island roo
Golden sexlink roo
Silver laced polish roo
Rode island hens
A Black sexlink hen
Cochin mixes (not these ones came out of brown eggs not white)
Some golden sexlink hens mixed in
Thats it.
You had previously listed the Silver Laced Polish rooster as the father of all the chicks.
Were they all in the same pen together? Because if so, any rooster "could" be the father of the chicks.
You should be able to confirm that as the chicks grow: if they have a Polish father they will grow crests on their heads and will probably have a duplex comb, but if they have any other father they will have a single comb and no crest. (It's hard to see combs on tiny chicks, so I'm not sure what kind the black chick and the gray chick have.)
The fist chick: silver layced polish roo X golden sexlink hen.
This chick shows a lot of brown. That should not be possible with a Silver Laced Polish father. The father must be either Rhode Island Red or Golden Sexlink. I don't know which hen would be the mother, but Golden Sexlink is certainly possible.
(If it grows a crest on the head, that would mean the Polish really is the father, and I would be wrong about the color genetics.)
second chick black sexlink hen X silver layced polish roo
Those parents are probably correct for this chick.
But if does not grow a crest, it probably has either the Rhode Island Red or the Gold Sexlink for the father. If it has no barring, it cannot have a Barred Rock father.
The mother probably is the Black Sexlink, because I don't think any of the other breeds could produce a black chick like this.
silver layced polish roo X ??? Brown layer maybe another black sexlink maybe something else
That chick looks blue to me, which should not be possible from that list of parents.
So I'll just say it's a mystery for now, and hope it becomes more clear as the chick grows.
Crest would indicate a Polish father.
White barring would indicate a Barred Rock father.