That "cloudy" egg could have been viable yet. They often get a cloudy look for a couple days about half way through development as a wider network of fine veins develops. Never toss 1 the 1st time it looks suspicious unless it stinks or is leaking. They often surprise you and are fine in a few days.
It was the mix of being cloud and the veins disappearing. and when i turned it while candling it had bubbles in it. If i could have cracked it open it would have smelled nasty.