The little one should be alright. We have two Appleyards who hatched about 24 hours apart. That 24 hours really made a difference, too, because the older one will eat out of our hands and come up to us but the younger one won't even though we held them both a lot as they were growing up.
I'm so...
In my experience, others' may be different, it's better to lock down early than late. I've had issues with slow development from lower-than-indicated Temps from a now-retired incubator with both chickens and ducks. They still hatched after being in lockdown for a whole week. Yours look like they...