Spike needed to be told every day that he wasn't going to give up and it wasn't acceptable. He wasn't alone and someday he was going to see again. I wonder if that is a sign of arthritis. A diagnosis from a vet would be indicated and appropriate medication prescribed. I wouldn't worry too much about Lucy not leaving her stall very much.
Pigs have a tendency to sleep away the bad winter weather.
Lucy is burning calories by trying to stay warm so it just helps the diet along very nicely. I hope these few lines encourage you to keep up the good work you are doing for Lucy. Because pigs love to eat, they are prone to becoming overweight. It is our job as pet pig owners to control our pig's food intake providing the correct diet as well as amount fed. Food consumption must be limited, not free fed.