Here are some photos of *his* progression, as well as a couple of the White Crested Black Polish that I know for sure is a hen, for comparison. Sorry, she's got some "no-peck" on her head - I can't get a few of the others to stop pecking her head feathers. She's at the bottom of the pecking...
Thanks all! Judging from photos on other threads it sure seems as though he's a cockerel, but it also seems as though a few surprises pop up, here and there. It would sure be nice if chickens had the external bits like everyone else. ;)
Awe, I was hoping for a roo. That one behaves differently from the other polish hen, being a bit more alert, more calm, and far more defensive against the other hens. Alas, it's roughly still the size as the polish I know for sure is a hen. They're about 17 weeks.