As far as I see it from a genetics/pedigree point of view is:
F1 = Asian Leopard Cat (100% wild) x domestic (0% wild) = approx. 50% wild
F2 = F1 x domestic = 25% wild
F3 = F2 x domestic = 12.5% wild
F4 = F3 x domestic = 7.25% wild (SBT)
F5 = F4 x F4 = 7.25% wild (SBT)
SBT stabalizes and dosen't continue to go down in wild blood. Of course you can't pick and choose if the kitten gets EXACTLY half the wild genes from each parent but its a pretty close approximation.
The reason it stabalizes is because half the genes from the F4 are passed 3.625 and half of the genetics of the other F4 that is 3.625 so all SBT's have a minimum of 7.25% wild blood (minimum minimum).
I don't know if I'm making any sense but what I'm trying to say is it dosen't matter if you have an F10 or an F4 most likely they won't have under 7% wild since that is the absolute minimum. It just dosen't go down anymore.
Now take the 7.25% and plug that back into the original equation and you get:
F1 = Asian Leopard Cat x Bengal = approx. 53.625% wild
F2 = F1 x Bengal = 30.44% wild
F3 = F2 x Bengal = 18.84% wild
F4 = F3 x Bengal = 13% wild (SBT)
F5 = F4 x F4 = 13% wild (SBT)
So there is a variance from 7.25% to 13% from teh original bengals that were crossed with a domestic to the nowaday bengal to bengal cross.
This doesn't take into mind that some F1's can be up to 80% wild at times when you cross and F1 back to an Asian Leopard Cat and stengthen teh wild blood. Many lines of bengals have this as well. The only way to know is to look at your cats pedigree.
So because of this it dosen't matter how late the generation is, CFA still sees every cat to have to much wild blood. Unfortunate though. I do hope eventually they change their minds. I'm a proud owner of an F3
and she is a truly wonderful cat.