Mystery rescue chicks breed(s)?

[turkeybirdpecky]

Someone in an apartment building had these guys for free. Any ideas? The smaller darker ones have feathers on their necks that look like our silkies feathers. And they are very friendly. They all came to us the same size and now the white one is significantly bigger, and tens to squabble with the other chicks.

 

[The Moonshiner]

Thinking the two reddish ones might be some sort of red sexlinks.

 

[turkeybirdpecky]

The white one has funny hair and cheeks, thoughts?

Updated pics. They're very tame. The smaller darker of the two caramel ones loves sleeping on the children.