Alright, so I my husband got home and I made him hold the larger of the two for some photos. Before taking these we noticed how the neck and back feathers were slightly different on the larger one. I feel confident after all the responses that they are most likely pullets with maybe one assuming the role of a roo, however, we then noticed the difference in feathers. So I hope these pictures help and as always appreciate everyone's input. Many thanks!
Pop the one you are suspicious of in your garage over night. Hopefully if its a boy it will crow for its girls in the morning and you will know for sure.
I believe it tends to be only older hens that crow not young pullets. Could be wrong though.
The lighter colored bird is the rooster, the one you posted those up close pictures of. At this age, a crowing bird is a rooster. Hens don't do that until they're older, or have hormonal issues.