So is there any chance that this one is a pullet? I mean, do pullets ever have their combs turn red by 9.5 weeks? Or is it pretty much a dead give-away that it's a cockerel when it's red by 8 weeks (it reddened up between 7 and 8 weeks of age).
A pullet will not get red in the comb until they are almost ready to lay eggs, usually around 14 to 18 weeks old. Any bird younger than 10 weeks is nowhere near egg laying age even if it was a super fast maturing hen. Comb reddening before 10 weeks is always a sure sign of a cockerel.