That's the same thing Meltzer said about not planning for overruns.You don't know how good a match is going to turn out before it happens.
Pro wrestling is all scripted, and modern wrestlers choreograph everthing down to the most minute detail. Knowing that, you know that there's a higher likelihood & higher probability that Top Flight vs the luchadors would be a smarter choice for your flagship show than Riho vs Ruby Soho.