My experience with the Marans breed is that the pullets feather out faster...so by 2 weeks, the ones without tail feathers and lots of down still - I would lean towards roos. Also, the boys in this breed rapidly develop their comb. Pronounced comb is going to mean roo. Best of luck with your littles!5 actually looks like a girl to me. 6 Im not really sure maybe pullet. i think 7 might be a girl also. And 8 I would say girl to it to. looks like all girls to my but i'm no expert
p.s sorry i posted twice the other time,my computer was acting funny.