These two things don't go together.The bigger one --Tiger, has a pretty bright comb and was in the coop quite a bit! I'm hoping that she was checking out the nesting box and will lay soon. We let them out to free range yesterday too, and Tiger was just anxious to get back in the run! They are currently being quarantined and seem healthy. Maybe I'll post some pictures later today!
I assume your other birds free range?
Hope these new ones are healthy......maybe you know this already, but....
Have you checked them over real well for mites and/or lice?
Google images of lice/mites and their eggs before the inspection so you'll know what you're looking for.
Part the feathers right down to the skin around vent, head/neck and under wings.
Best done well after dark with a strong flashlight/headlight, easier to 'catch' bird and also to check for the mites that live in structure and only come out at night to feed off roosting birds.
Wipe a white paper towel along the underside of roost to look for red smears(smashed well fed mites).
Good post about mite ID by Lady McCamley:
https://www.backyardchickens.com/threads/my-chicken-has-mites-now-what.1273674/page-2#post-20483008