The overall coloration, granite-like speckling, the flames, blushing, the dot behind the head, back striping...
I really doubt it's chocolate, and sable is one thing I've been thinking, but then the offspring didn't come out as I would have expected...the male bred to a het red axanthic, 4 eggs, 1 normal(I think), 1 HRA, 1 definitely not normal and not really sable looking(IMO), and 1 neat enough to hang on to. Here are pics of the 1 obvious and the other one I kept from the clutch that was cool enough to keep(I still have the HRA, but it's just an HRA).
There are enough similarities between the two that I think the second one pictured may just be a much less exaggerated version of the first one pictured.