you could also get solids, If what I heard is right. Barred roo over non-barred hen is NOT sex-linked, but the other way around it is. You have no way of knowing what is a boy or girl there until it shows pointy saddle and hackle feathers, lays an egg or crows. Since there could be roos there with a single barring gene, they could only pass it on to half of their chicks i think. The barred hens will pass it on to their male offpsring, (I think. Someone correct me if I'm wrong.) You are right about the BBS genetics, sooo.... all of that being said, you could get barred or solid, in blue, black or splash, and have it be either a roo or a pullet and not know until a few months from now. Hope that helps.
edit to add, if you cross the single gened offspring, you could still end up with not knowing either. You could end up with single gened males, or double barred gene males, which "should" have a more prominenet spot on their head upon hatching. But you could also get solid pullets, single gened pullets, single gened roos or double gened roos. It will probably take a few generations to set the barring gene right, along with the pea comb and the beard, of course, just for looks.