Ummmmm....... until the final feathering it is very hard to judge quality of barring. Fast feathering birds have worse barring than slower feathering birds; there is a genetic reason behind this. The problem in Barred Rocks is that the more productive they are, the smaller and more irregularly barred they become; the more they are bred for greater size and more even barring, the worse laying becomes. This was perceived as a problem as far back as the first decade of the 20th Century and acknowledged as such by poultry researchers. I think what you are looking at is a cockerel, which has more white, and a pullet, which tends to be darker. The same thing is seen in the cuckoo colored ancestor of the Barred Rock, the American Dominique.
(I currently have several American Dominique 2013 hens - they behave very much like Barred Rocks with ADHD.)
(I currently have several American Dominique 2013 hens - they behave very much like Barred Rocks with ADHD.)