If Im not mistaken, the barring gene has to express itself if its there, it doesnt "hide". Im sure the experts will correct me if Im wrong.
Edited to add: in looking at your roo again, perhaps he isnt double gened barred. He's pretty dark for that. Are you sure someone didnt play a joke on you and slip some eggs in your incubator? Id bet my mortgage payment that those 2 didnt hatch from that lav. rooster, esp. if that roo came from Jody.