We found this to be true with ours too. We also had some roos that never grew up. At least mine never did. The other roos were fully mature and one little guy just didn't thrive at all. Obviously a rooster, but very hen like in behavior. Not sure what he would have turned into if he hadn't been killed. I know Trish had one like that, not sure what happened with him.
Edited to add photo - you can see the difference in the little guy on the far left compared to the other two roos in the picture.
Edited to add photo - you can see the difference in the little guy on the far left compared to the other two roos in the picture.

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