Probably a bit early still, but your guesses seem right to me at this stage. If you want some expert opinions, I recommend posting each bird individually, full body side view like my avatar photo, head on close up of the face showing any comb and close up of head in profile. Honestly, though...
Hubbies will always think your nuts when it come to your chickens!😊
My silkies went outside at night in the same temps at 5 1/2 weeks. They complained for a bit, but then they were just fine. Don’t worry!😊