If you really want to prove it as a het. red axanthic:

1) Breed it to a homozygous red axanthic, not a cinnamon. If you get homozygous red axanthic from that clutch, then you know your dinker is het. red axanthic.
2) Then you can breed it to a cinnamon to produce gargoyles, and actually call the gargoyle looking babes gargoyles.