I said it for the same reason Debib states about pattern and due to how it's early feathering tells you it's female and due to the dark wash on legs also telling you it's female as the males of the various patterned Rocks will have yellow legs. Must be a sex linked inhibitor as the males are always yellow though the pullets legs should still be yellow they can have from a light wash to full dark legs that's not desirable. Without the pattern being definitive the bird would still be telling me it's a pullet. I only raise Plymouth Rocks so kinda see it all at a glance anymore.
