I just hatched out some blrw myself and the two cockerels I ended up with had a lot of color on their chest just like yours but the pullets had much more black/grey. So from my experience I'd say that is a boy. Sorry to be such a party pooper 
And also my cockerels at 12 weeks still don't have saddle or hackle feathers.
My pullets are just starting to get color on their chests... How does this particular chicken compare to the others you hatched out ?

And also my cockerels at 12 weeks still don't have saddle or hackle feathers.
My pullets are just starting to get color on their chests... How does this particular chicken compare to the others you hatched out ?
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