Pretty sure Mysty is a pullet, and that BB and Cleon are cockerels. Not 100%, though. Powder Puff is definitely worth keeping; a single comb is easily bred out, and his type looks very nice!
Do check the tail though; make sure it is not crooked. Photo makes it appear that it might be, but it could just be the photo angle. That is NOT something you want to have to deal with.
Important info on the single comb!! So great to have your input!! Please tell us how you are able to determine type on Powder Puff from that kind of photo? Is it balance?