Here is a link to some pictures of my chicks. You can see the difference in your Barred Rocks and mine. The lighter colored ones, with more white, are supposed to be roosters. That's what my father-in-law and others have told me.
I was suspect of this from the beginning because I noticed this one was lighter than the other ones. I have a SLW that is the same way, one is lighter than the others. I really didn't need all these extra roosters. I guess I will just raise them up and butcher them. I have a hatching plan and a RIR is what I want for my rooster. Just so I know is BR X BR = a Barred rock?