Tigertiger2 and Kenny are both right. Shirley Crabtree was an accomplished wrestler and British champion long before Big Daddy. I didn't see him so don't know how good, but definitely someone to be taken seriously.
Emotions still run high as to the part he played in wrestling during his later years. It is very easy to dismiss him and speak in negative terms, but it was no simple story, maybe one Wrestling Heritage will explore in greater depth one day.
Meanwhile he is on this site, a Big Daddy article in issue 2 of the Ringsport pages, and a Shirley Crabtree entry in letter C of the A-Z. He'll be back in issue 3 of Ringsport with a report of that first Shirley Crabtree v Kendo Nagasaki televised contest.