im wondering if he is a BR over something because his legs do appear yellow n the newer photos, there is just something different about him than a BSL. and i dont think he is a pure breed either.
blue barred plymouth rocks are a mix between a andalusian rooster and a barred rock female, from what i have found on the internet they are pretty rare. i strongly believe that this roo is a BSL. if what he has on his feet are feather stubs than that further proves that he is probably a bsl...
i see pink legs, that would mean not a dominique barred rock or cochin. he also has no leg feathering. as black cat stated single combs are recessive so he couldnt be half dominique. i am thinking a cuckoo marans unless she knew he was a mix