I hope you had stern words with said teenage family member. Maybe handed them the body of your bird so they could see the consequences of their actions.
I don't think that even if the celadon did explode (it would really, really stink if it did) it wouldn't make dents in the egg next to it. I have had a turner crack jumbo eggs if they're too close together, but that leaves really distinct marks.
Your first guess on what happened is probably...
I'm sorry. The celadon is a lost cause. I'm not sure about the other, but in my experience even if a cracked egg makes it, the chick always has growth problems and rarely makes it.
I'm sorry. The first bird I ever had to cull was a chick too. It was very, very hard emotionally, and so easy physically that it seemed to make the emotional side even harder.
I've never had an albino that I didn't have to cull. Personally, I would try the shady outdoor pen, but make sure that it doesn't get direct light. I also wouldn't breed it.
Good luck, and let us know how it fares.
Glad to hear that your chick is behaving. I'm guessing it's not in the picture above?
You also have what appears to be a real rarity. A healthy albino. You probably want to keep that one out of the sun and bright lights to preserve its vision for as long as you can. Albinos often go blind...