All of these look like hens. If any of these were roosters you'd know by now. If they were roosters they would have large red combs and waddles by now and would most likely be crowing at this point.
I don't think they will, I caught my chicks eating rotten things and they were fine, just keep an eye on em to make sure. If they do get sick let me know and I might be able to help.
What the heck?! Stupid human! I wanted evil guard chickens to protect me, not tiny, fluffy, cute chipmunk looking things! What are they going to do? Kill by overload of cuteness?!
Oh that's so sad! I'm sorry to hear. I hope your last little one will bond quickly and make new friends. I will keep my fingers crossed for you and will pray for them/you. :hugs