I hope to do a fairly large sample study
As well as finding many pairs, the question is whether you find more pairs that are successful or not.
I am not talking about just good horses but good progeny that prompted a repeat mating and whether it was justified/successful

I don't think there is any doubt that you are much more likely to produce a successful foal from a mare that has proven herself in the barn and a sire that has proven himself ( a principal I believe in and which I believe was first preached by Joe Estes 85yrs ago)