Looking at those photos, I'd agree with the person who said the chick looked very wet. I'd say your humidity was too high. Not just in lockdown, but all the way through. That's not to say that if you had had the correct humidity you'd have hatched healthy chicks though. I just had a hatch with half the chicks dead at about the same stage of development and I know my humidity was okay; if anything it was a bit on the dry side. But for your next hatch, I'd start by adjusting the humidity...