Yeah, the firsts 3 pic are the same egg right? That one looks like a late quitter. The other one with grey in the air cell is definitely trying to hatch. Does the grey move? The grey spot is the baby taking up room in the air cell and pushing on the membrane trying to internally pip. Put a star or something on that egg. You can gently candle it again this evening, it may be internally pipped by then. If you candle that one later make sure you don't turn it at all, hold it exactly how it was laying in the incubator. Don't tip it or anything. I'm excited for you! Hoping that one makes it. Do you have starter feed and a heat source for when they hatch? For feed Purina FlockRaiser works great.