Common Yellowthroat - Masked Juvenile

I was actually able to pish this juvenile Common Yellowthroat and few others out of the tall grass along a service road at Fernhill Wetlands this past Friday evening. I've seen several juvenile Yellowthroats, but this is the first that I have seen that was transitioning into adult male plumage. Its mask is about half grown in.

This juvenile was also with the one above. I wonder if it is a male or female? Best I can tell, both sexes look the same initially.