Skipper has a point as far as showing out side his camp in order to know what he has vs what others got. I knew of a camp who bred and checked their dogs against each other. When they started showing them, every one of them lost and curred out. They finally realize back yard breeding and being kennel blind was getting them nowhere. So they bought new dogs and started schooling out side their camp and now they're doing better than before.
Frosty Paw also has a very good point too. If you already have dogs no one else can beat, why step outside to find out if he is worthy when you could just put that prospect against the best ones on your yard, who already whooped all others.
In the end it's all about the quality of the dog that prospect is showing against. The way I see it, if my young bitch can handle 30 minutes without getting killed by a killing machine who usually finish her opponents within that time frame, then she is a bad bitch in my eyes.