You know, I started thinking about what I wrote, and I wondered!!! My girls from you are both barred, right? so in that case them bred to Sparky should have only gotten me barred or double barred offspring, and I've gotten barred, double barred and non-barred. So that doesn't make sense. Also, I'm pretty sure one of the double barred chicks was a pullets. I mean she was much lighter in color, and she was definately barred. Unfortunately she was also fragile from the beginning, and I lost her at about 6 - 8 weeks. Young, but I was pretty sure she was a girl. Sparky's boys have all been barred, single or double.
I was going by what that link to the barred discussion on the Cochin list said.. but I can see it doesn't happen like that in our breeding.