I have a theory about why your roo is the same color as the pullets. I can't prove that its true, but it fits the genetics of that color.
First -- barring is sex-linked. That means that hens can only have one copy of the barring gene, while roos usually have two copies. That's why barred and...
I don't know cuckoo coloring one way or the other, but I'm pretty good with combs. I can usually sex my chicks by the time they're 2-3 weeks old. By 9 weeks, the difference should be incredibly obvious -- as it is in your case.
If you've got more than 1 roo there, I'll buy the extras from you.