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That explains why it didn't hatch like the others did....and I agree. Kudos for doing an eggtopsy.

My guess is that this egg is a quitter. With ones that look like this, I carefully open it enough to be able to touch the chick under the membrane to see if there's any movement (usually, there isn't), and by doing so, I can determine if it's still alive. If it turns out that it is still alive...