I see!
I've now looked at their backs and taken a few pictures, and I only saw pin feathers on the two black chicks, 2 and 3. I tried spreading the back feathers on the others but couldn't see any pins on them..
1.
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2.
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(3 above, 2 below)
3.
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4.
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5.
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And a little side note:
I heard someone attempt to crow several times this morning (either that or someone was dying

), and when I went to check who it was I didn't manage to catch him in the act, but I saw them about half a second after it had stopped and I'm 80% sure it was nr 2. He looked like he was just done doing something naughty (or amazing, depending on whether you've been looking forward to them making that sound

) while the others were going about their business. But because I didn't catch him doing it I can't guarantee it was him I heard, of course. But with those saddle feathers coming in I wouldn't be surprised! Cause those are very cockerel-y, right? A fine paint brush shape like you said.
4 and 5 - pullets? Their feathers look quite rounded to me..
1 - pullet...? The feathers look round and I can't see any pointy ones like on 2, but that might be because 2's are easy to distinguish the shape of cause they are so bright and contrasted to his otherwise black feathering. I can't really see the outlines of most of the feathers with his/her splash coloring, they sort of melt into each other..

3 - I have absolutely no clue. I wouldn't even dare take a guess.

His yellow feathers look like they could be the shape of a fine paint brush that has had its bristles all worn down and going in all directions.. And I don't know how to interpret that in terms of pullet or cockerel..

What do you think?