Before I got my chickens, I watched this video on egg production, I forget the name but it's put out by an ag college, and the hens on the video had really pale combs as well. I just figured that it was due to living on the edge nutritionally. Most of their nutritional intake is converted to eggs and possibly the lack of exercise has something to do with it.
I'll bet that their combs start regaining their color with more nutrition and sunlight. Look at the comb colors on the exbat that the young farmer is holding. How nice that looks.
Congratulations on the save. I feel the same way about animals, including the little Beta fish trapped in cups in pet stores.
Mary