Yeah, this little chick has been a tricky one! I can usually tell fairly well by about 4-5 weeks, but not this one. Your right on your assessment, it's a roo comb on a hen body, so we will see what becomes of that! That's what I get for hatching out mixed breed eggs, it messes with the assessment. I could tell on the other three I hatched by three weeks, and they have all found homes, but just not sure with this one. I will update in a few weeks if there is any change, will be on the lookout for roo feathers or crowing.This one is a hard one. It has the body of a hen but the rooster's comb. Usually, most cockerels by 8 weeks would have some dark patches on their wings already. This one seems to have even pattern without dark patches. So, I am going to vote hen. Please update once you know for sure. I am curious if it is a rare pullet with 3 row comb.