Update on the crushed egg chick: It's been one stressful week of up and downs for this little cutie. His/her abdomen opened up again two days in and I could see what was left the yolk sac. Spent 48hrs bandaging it and cleaning it - thankfully it closed up again but the chick showed signs of infection.
I've been feeding it several times a day and it's only half the size of the others, but it's now starting to eat, drink, and socialize more with the other ones. What a roller coaster ride this has been. Lots of signs of improvement over the last few days though!
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The crushed egg chick is the little grey one in the middle of the food in this photo.