it comes from the fact that 1v1 on even terms in land/science/honor SOME of the war kds could beat the better whoring kds. And SOME those war kds have lost to average war kds. i.e. my kd beat beastblood when "relatively" even and we lost to XYZ when we wared them with a 80% nw disadvantage. So clearly that kd could easily beat beastblood, lol. In addition I'd argue that when some of the whore kds take the age off they can sometimes get easier wars as oooh i've always want to fight CR/BB/whoever lets just war em..."yea we lost but we gave an advantage and they weren't as good as they seem to claim"
With that said if u wanted to organize things u'd to top whore kds>top war kds>crappy whore kds>crappy war kds......and the top whore kds are "better" in that over an entire age they will consistently perform while war kds mess up via the whore/cow/pumping part of the game that typical war kds get to ignore