It was the same when i used to show my English Bull, he was out of Albrax Audacity the only English Bull Terrier to ever win crufts it was in 1971, he was a cracking example of the breed just like Bills Staffy, but its a case of what you know and who you know in the Bull Terrier showing world mate, a case of if you breed with my bitch and im a judge im going to pick you dogs out it in the shows, makes the pups worth more, sad but true.
I have seen crap dogs win shows against great looking dogs just for this reason.