I believe that the chick is a Cornish X meat bird. They are slow to feather, messy over eating little poop machines. The pictures you have posted do not appear to be of a sick bird - just a 'normal' meat bird.
Got a second with one of my males and second in the other class with a friend's male. I hate second. Today was the final day of the trial. We ran 15 " females, and a pup sired by one of my males won the class.