I've never seen a white chested one and I do think it's a cockerel.
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One is clearly not a purebred Barred Rock. And since they are all from the same source, it is reasonable to think that the others could be mixed as well. At this point, the others aren't obvious cockerels, but that may change in another week or two.
Thanks so much everyone!!! I guess that explains why the white belly was confusing me so much