It looks like a disjointed femur from those pics.
Since the option is culling, try a last ditch effort.
Hold the chick upside down in one palm and pin down the wings with your little finger and thumb. With the other hand, firmly but gently grasp both legs just above the feet, and apply VERY...
The natural hatching process definitely gives chicks a head start in the world. Assisted chicks can and often do catch up, but they still need to go through the "train the muscles" process before they are up and about.
I've had assisted turkeys lay in the incubator for 24-36 hours after...
No progress in 36+ hours, I'd have intervened long ago.
In the part of the membrane that is visible, can you see blood vessels that look like those you saw while candling? If those have retracted, since it is a side pip, then the wait time should be over.
It should be safe to dampen the...
I'm on my way out the door, but before you do anything, read https://www.backyardchickens.com/a/step-by-step-guide-to-assisted-hatching
I'll see if I can rally some help for you...
It does look dry to me. Can you add another warm, wet sponge?
After no progress after that much time has passed, I'd intervene on the partially zipped one. It looks like he's glued in.