Well, Its been a while, but as the story of these two ended today I figured I would update. I've seen other members mention that posters rarely post results, so here are mine:
Dasiy (the severely underweight BO mix) was doing wonderfully. She gained weight, FINALLY stopped sneezing, and was actually a pretty awesome little layer. About a month ago, I came home to find a trail of her feathers all the way from my backyard, across the street and into my neighbors backyard. I was heartbroken and on the warpath; she had been doing so well. This isn't the first time this guy's WOLF hybrids have gotten out and come onto our property to kill things. I demanded that what was left of her be returned (which it was) to be buried. We filed another complaint with animal control and set up the game camera to try to catch the next violation without the death of another animal, but so far, they have stayed away.
And today, NayNay.
Poor Nay, she never quite recovered from the lash situation. I was very hopeful as I hadn't had to soak her in a long time, and she was finally pooping normally. I had already decided that I would be her "hospice home" and as long as she was comfortable, she could just do her thing. It goes without saying, I think, that she never laid a single egg. I went out today and found her with a horrific prolapsed vent. I put her in the pen and came inside for a google sponsored crash course in prolapse repair. After getting back out there and cleaning her up to really see what what was going on, I decided it would be best to let her go. She had at least three inches of necrotic looking tissue hanging with a cauliflower (presumably lash) looking mass at the end. I didn't even know where to begin to help her. My husband put her down for me and buried her beside Dasiy.
Take away from this experience: I'm glad I did it. These two got to live good (albeit short) lives with daily freedom to go and forage wherever they wanted. They never lacked for food or clean water, or a dry secure place to sleep at night. It was a heck of a lot better than where they came from.
As for me, I really feel that it made me a better caregiver. I learned a lot about how to read them, treat them, and when to just accept that I've done all I can and to just step back and see what happens. I also have a pretty well stocked chicken medicine cabinet now.
@Wyorp Rock and
@Cragg Klefor, Thank you both for your guidance and support.