I don't mean to hijack your thread, but I am glad to have stumbled across your post, as I am going through the same thing with my flock of 6. Last weekend, we had temps below freezing for quite a while. The only two birds who came away totally unscathed were our Lt. Brahma and Olive Egger, both of whom have pea combs. Our ISA Brown got it the worst, but she also has the biggest, floppiest comb.
When I tell you I have chicken mom guilt... Oh my goodness... I feel absolutely awful about it. She seems happy as ever. Still laying almost every day. Still eating and drinking and walking around. Still the alpha. But her comb looks rough (very much like the third picture you attached). I have no idea what to expect in the next month or so... Will she lose the whole thing? Just the very tips? If she were to lose the whole thing, I wonder if she'd suffer long-term health problems because of it or get along just fine.
All I can say from this ordeal is that I hope we never get another weekend like that. And, pea combs for the win!
Best of luck with your flock. You're not a bad chicken mom at all; you're doing your best to deal with the problem at hand.