I'm saying pair also on the Wyandotte. Not sure of the others. My older three all have reddened combs by 6-7 weeks and I know for a fact 2 of them, possibly all are girls. No one has crowed. Perhaps I will have early eggs??lol. This waiting game is difficult! Good luck!
Congrats. You have a beautiful pait of BLRW. Also to answer any question about growth. Alot of chickens grow diffrently. Some grow in size while some feather out faster.