it is only a great line when tried + tested , to the max !if there is a failure in the great line , you do not continue the blood-line with said failure !
well, that is my 2 cents worth !
Do you think there is such a thing as a great working blood line?
in short - yes ! a family of dogs that produces a high % of digging dogs/bitchs , litter after litter , generation after generation , is a great bloodline !
to me , but it some have different opinions on workers and ''digging'' !
unless you're doing them big sprawling spots regular , well.......
First your saying if there is a failu