The last 2 pictures are the same chick and I think cockerel? the 1st picture, I'm certain is a cockerel as it's picking fights with a mini silkie that I'm convinced is a cockerel too. Pic. of the 2 silkies below.
my guess, 1 is a cockerel, 2 pullet, 3 pullet but the way it's standing also makes me think cockerel... so a pullet? on that one, 4 cockerel, 5 cockerel