Concerned about a dark spot on silkie egg, day 24

[Samrox4u]

I had 5 silkie eggs scheduled to hatch on Friday day 21, we have had only one successfully hatch, one died during hatching in its shell and then we were worried last night and candled the remaining 3 eggs and 2 have no movement and 1 has movement but a dark spot on shell, I assumed the eggs was rotting, but glad I didn’t toss it!
A little background on the eggs, they were shipped to us and the airsacs seem large in the remaining eggs and a bit saddled.
Should I just leave this egg alone? It’s day 24, I’m so afraid of losing the last chick from this hatch. Or do you think something is wrong? Here is a photo

 

[AgnesGray]

Since it's so late in the game, I'd consider making an air hole, in case they do still attempt to hatch.

Here is a guide to assisted hatching:
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/

Have you tested the temperature in various places in your incubator? It may be that the temperature is running low, if they are this late.

Good luck to you and welcome to BYC!

 

[BelovedBirds]

I had 5 silkie eggs scheduled to hatch on Friday day 21, we have had only one successfully hatch, one died during hatching in its shell and then we were worried last night and candled the remaining 3 eggs and 2 have no movement and 1 has movement but a dark spot on shell, I assumed the eggs was rotting, but glad I didn’t toss it!
A little background on the eggs, they were shipped to us and the airsacs seem large in the remaining eggs and a bit saddled.
Should I just leave this egg alone? It’s day 24, I’m so afraid of losing the last chick from this hatch. Or do you think something is wrong? Here is a photo

bruising can indicate that a chick is trying to pip the wrong end. Have you candled the air cell to check for an internal pip? Could you see the yolk through candling?
AgnesGray linked a great article, definitely check that out!