I have studied the pictures of your 2 R. I. Reds. You say they were 'rescued' about 3 weeks ago. Where they were 'rescued from? In looking at the beaks, they have been cut - it is possible they were production egg farm layers. Young birds of this breed (sex-links) have bright yellow legs. Your hens have almost white legs. This makes me think they were layer for a long period. The yellow pigments have faded (gone to yolks). I would think your hens are 1 year and a bit more. Also, if the combs are getting redder, it is possible they are getting to start laying again.