because unless you keep breeding the right[game] ones, you will lose gameness.
i believe gameness is a recessive gene, you need to keep it to the forfront,
if not you basically have a 'show' dog which is nothing like a true apbt
you breed for gameness and everything else will fall in line and trying to do that can still take generations.
like when you see the dog shows on the tv, you have 'field' and 'show' dogs,
might be called the same but, they are definitely not the same.
just try to tell someone that works his fox hounds that your gonna mix some 'show' blood in to make his dogs look prettier, wont be worth nothing in the field but they will look prettier.
aint really quite understanding that thought process