Candling experts, what does this mean?

[Life is Good!]

Our 3rd broody hen has deserted her nest during the daytime hrs (remember, it's only 100 degrees out there!), so I was very concerned about her last two eggs. The first egg hatched Monday, 6/25. She stayed on the nest two additional days, then started being out in the yard with the other Mom's and chicks and hens and rooster - think playdate of sorts. Three eggs were deserted, after float test and careful candeling, I claimed the eggs yesterday for the day. At nightfall, she returns to the nest and reclaims the eggs and sits tight all night - broody growl and all. In the morning, when I come to open the pop door, she and her chick amble outside and she doesn't sit at all during the day. Again, it's 100 degrees outside with about 50-60% humidity.

1. One egg never was fertilized. Not sure how that happened, rooster seems to love on everyone....but musta missed this one....cracked this one open and no dot or anything - just a really really broken yolk!
2. One egg has a very large airsac, a dark ring in the outer edges of the shell and I cannot see into the space (full?). Is this egg viable? I see just a few red, very red veins. Nothing distinct or clear inside this egg, despite being able to see fairly well into it. No movement after observing it for much more time than I wish to admit!
3. One egg has a small airsac and much movement from the chick inside. I can clearly see the veinings, and today's movements are less large because the chick has obviously grown since yesterday. Tons of fun to watch - again, more time than I care to admit!

Question - is this large airsac egg (#2) viable? Or has it died? The eggs were all supposed to hatch by 6/25, but obviously, these two must have gotten mixed in somehow...despite marking the eggs and taking out unmarked ones.

Question - with temps/humidity so high, is it safe to leave them in the nest or do I need to claim them during daylight hours? Mom is more than happy to sit tight all night, but wants to go play during the day. And I'd really rather have it hatch under her and be accepted by it's sibling.

Thank you for all your help! I don't wish this last little chick to not have a chance! And if the other egg is done, I don't wish it to explode on me!

 

[OldChurchEggery1]

Perhaps you had a nest intruder early on and another hen left a late "present." If you know for absolute sure that those eggs were the same age as the others, then I wouldn't count on them hatching. If they were due almost a week ago, anything left would likely hatch malformed from being the same position so long. That has been my experience in incubation- nothing still in there the morning of day 23 is formed right. The one exception is that my Jersey Giants sometimes take a day longer than my other chicks to hatch. Unless these are a rare breed or extremely valuable eggs, I would let nature take its course, which will probably mean they will not hatch. If you want to try the most promising egg in your incubator and just leave it there, that would be an option. However, any chick that hatches now would be days behind its nestmates, meaning it would be less mobile and susceptible to being smashed or suffocated by a hen who's more concerned with keeping her active charges in place.