While eggs might ordinarily be able to resist mold, most likely by keeping the spores from germinating, putting them under a high load of mold spores can lead to infection of even healthy eggs. Furthermore, once the mold spores have germinated on the bad egg, the actively growing mold can spred to the good eggs as well (actively growing fungi and fungal spores can be drastically different in their ability to infect). Analogously, you might be able to resist getting a cold, but if you are kept in 20' x 20' unventilated room with 50 other people that have the flu, what do you think is going to happen?
I seriously doubt that only the eggs in contact with the bad egg happen to be dying from the inside, more likely they were just overcome by the actively growing mold. I think it is entirely possible to save the eggs, but I wouldn't be that suprised if the mold just keeps coming back.
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when life hands you lemons, make super lemons, bumblebees, etc...