I was actually browsing those pics and it really caught my attention regarding the possibility why it produced an ivory. There's no clearer pic of the mom's belly, making it hard to speculate if its truly a yb. But how can he produce an ivory if the dad would be the only one carrying the yb gene? Confusing right? My opinion regarding the breeding is that the mom maybe just a not-so-very good example of a yb, but a yb indeed. And the dad may be a lesser yb, that he just didnt noticed due to lessers very light coloring and hi flames. Well, just my 2 cents. Unless its a double sired clutch.