Funny behavior!
2 of the suspected cockerels, En Croute (Langshan Green), and Dominique Green, are much bolder than the rest of the mini-flock, getting closer to the older ones than any of the others.
The Ladies just drive them back a bit, satisfied when they yield ground and turn over the weed or veggie scrap.
The Splits, especially Lickety (Split Red), do more chasing. I just watched Dominique Blue leave the mini-flock behind, go well into the Splits' territory near their coop, then get chased not just back to chick territory but clear around the brooder-coop until (s)he ducked into one of the hiding spots (a bit of plywood leaned up against the wall that's too small for the Splits to fit into).
(S)He squirted out the other end, leaving Lickety wondering where the little one had gone.
I'm not sure how serious this chasing behavior is. It seems to happen only in response to provocation -- En Croute or Dominique Blue encroaching into the Splits' space. After the initial hour or so the Splits stopped deliberately following the chicks around. No one is guarding feed or water.
I'd have given them another week of see-don't-touch but they're already big enough that the smallest Split can squeeze through the openings into the "playpen" through the smallest gate I can make in the current setup. I *might* be able to make those openings smaller tomorrow if more experienced people think I need to.
@aart, can you advise me?