Well, here is the outcome with my chicks. There are no survivors. I had only three left and something (predator) killed them and only ate one of them. The three with difficulties I culled previously, after it became obvious that their quality of life was just a struggle with no possibility of it improving. The one with the kinked neck couldn't eat or drink and just backed around in circles. The ones with splayed legs just couldn't walk and were unable to sustain themselves. (I even tried making a sort of wagon with a cut down plastic milk carton and set of wheels and velcro straps, but they still couldn't move with any success because of their leg positions). I think the lesson here is to cull sooner and avoid all the struggles.
Where I'm located (rural Northern California), there are plenty of wild animals; my neighbor about a quarter of a mile away, saw a mountain lion a few weeks ago. I have a very solid, secure chicken house but I don't have a covered pen. There are plenty of critters that can climb over my fence. Before I put any more chickens out there, I'm going to fully enclose it.