Need help sexing! All of my chicks look different!

[taterschicks5]

I have 4 one month old chicks.
I was told 2 are sex link/plymouth mixes, one is a silkie and one is a silver laced cross.
If any were boys, I was told the lighter of the sex link mixes was, however the dark one grew a comb!
Can anyone help me figure out what I have?
THANKS A Million!
-- The darker of the 2 sex link mixes

-- The dark and light sex link mixes
--The darker sex link, silver laced cross and the lighter sex link.... My cutie silkie is in the back

 

[destinidawn]

I would say the dark one is a cockeral and the light one is a pullet.. But I am new.. Hope someone else can tell you better

 

[chickenmaniac]

the partridge rockchick (brown) is a roo

 

[nurse_turtle]

That dark one is a roo and the other 2 are pullets.

 

[aoxa]

Dark one is the only roo I see He looks like a partridge cochin. I find it funny that he almost looks pure!

 

[taterschicks5]

Thanks for all of your help guys! I'm new to having chickens, but it's turning out to be super fun and a learning experience!