it's a recessive gene (rare/harder to get visual babies), and it's the color. the fading of orange into a deep red up the sides?? incredible! i think it's amazing. seeing one in person is nuts; i saw some at NARBC and photos do not do their color any justice.
of course, this is just my opinion.
Yeah, should've figured it was recessive. I saw a few at Tinley, too, just not my cup of tea.