Gender concerns and LF or Bantam? <Pic heavy>

I got six chicks out of pullet bins at the feed store (hatchery: Welp/Privett). I've been concerned for some time that one is a cockerel, maybe more. Please, let me know what you think.

Also, my Dark Brahma has always been a smaller than the other birds, and a little late to feather out. Either she is a bantam (and cockerel? EEK!) or she came into the store a few days later than the others. I'm pretty sure they weren't labeled as bantam. What do you think?


ETA: considering when I got them, I estimate about 5 weeks.

The whole group:


Jersey Giant (not sure about pullet, first time with this breed):



SLW:



Light Brahma (I'm thinking cockerel):



Dark Brahma (bantam or younger LF?):



Red:


California White:

 

Darn, sorry about the size. If anybody would like larger versions of any pictures let me know and I'll post it again.

 

Yeah, that's what I've been saying the whole time. Let's hope he's farily quiet. My Buff Brahma rooster wasn't too noisy.

What do you think about the size difference between the Light and Dark Brahmas. I got them at the same time, the dark was a couple dollars more expensive than the light--I see Welp does charge more for bantam Brahmas. So, I'm a little worried I wasn't paying attention and got a Bantam. She is currently the smallest of all the birds--even smaller than the Cali White and the Red.

I'm bummed that the "Pullet" bins have let me down this much!

 

Thanks, I haven't been too worried about the white and red--I assume they're a little better at sexing those than the Brahmas. I'll re-post these birds in a few weeks with an update.