I don't see any that look like males, at least in these photos at this age.I just took these today. And they all turned 7 weeks today. The smallest one is one of my ISA Browns. From what I can tell, they're combs still look yellow and smallish to me. I haven't seen any waddles developing.
I hope you have a plan for a bigger coop pretty soon, because those chicks are going to get a lot bigger, quite fast.