The Texas angus people have tried for years to get shows to accept D N A testing for steers at the majors, reason it wont fly, too many will cross bred sires will D N A as straight bred.
I remember back in the early 70's. And the blood typing started, a lot of bulls would not type, the dam was no longer among the living, and they would splice it together by using 1/2 sibs, you take that and the evolution of the pedigrees and I have no doubt the bloodlines became legitimate.
The steer posted some back is out of a Luxon of wye grand daughter and a pine drive son.
Forgive me, but I'm really not convinced that all this " I know x bull is not a something" is written in stone.