I didn't hatch them, I bought them at about a week old from someone else who got the eggs from a BYC person and hatched them. I know of the 6, 2 of the hens and all 3 cockerels were easily sexed at hatch. The 3rd hen, the one I banded and who has the funny feather pattern, wasn't. She had faint chipmunk markings, and was colored more like the males with a light colored head but did have an obvious "chipmunk" stripe on her head. They thought she was a cockerel, I thought possibly pullet because of the pattern she was feathering in, it matched the other 2 pullets who all feathered in their chipmunk stripes first, the cockerels feathered in a different pattern.
I have been taking photos of them since I purchased them to track development. Right now my plan is to breed RB x RB. If I find some quality RIR I might take that on, but I have to many chickens already

I'll be selling off a bunch of POL pullets in the spring, once I get the numbers down then we'll see. It will depend on how good of layers these RB are, I wanted them for the autosexing but my #1 reason for keeping chickens is the eggs and meat, so I'm still looking for breed(s) that meet the requirements of an attractive layer flock with a variety of colors/patterns, that lay well, have a robust immune system, and are good foragers. If they don't meet the above requirements autosexing isn't going to be enough. If they do, then they may become one of my projects.