Is our cockerel actually a hen?

[bumblebird]

Our mid-March pullets have recently begun laying in the last 6 weeks. We have 5 birds, and one looks more like a cockerel than the others (below), but we've been getting 5 fully formed eggs 3 out of 7 days this week. Last week or two we have gotten 3 eggs with paper thin shells, but now we're getting good solid eggs every day before 3 pm.

They are 3 Buffs and 2 (probably?) White Rocks. But one of the white ones is the bird in question. "He" is amicable, he squats when we go to touch him, and hasn't made any sounds hinting toward being a roo.
We picked them up from a local farm store who gets their chicks from a hatchery, and the 2 kinds they were grabbed from were Rocks and Buffs, but could it be that one of them is a hen of another variety?

Is any of this normal? We had been getting 3 to 4 eggs, now we're getting 4 to 5 eggs. Or should we change his name to Kaitlyn?

 

[keesmom]

Pullet.

 

[bumblebird]

You think so? This one looks so different from the others. The others have short little combs, and this one looks so definitely different.

 

[junebuggena]

Looks like a Leghorn mix. The earlobes are halfway between white and red. Leghorn hens have really big combs.

 

[bumblebird]

Thanks! That makes a lot more sense.

 

[Ol Grey Mare]

She's all girl!

 

[bumblebird]

That would explain the slightly lighter egg. Leghorns are white egg layers, and Rocks are brown.

 

[DanEP]

I'd think mix too. Comb is more like wl but body is more rockish. Should be a good layer tho.