Two things Zazen:
1) "When rooks were outnumbered 2 millenia ago.." by Bishops? Yet according to your unimpeachable stats the Bish universally suck so it must not have been too bad after all right?
In fact using your own statistics for 2003 each Rook is "worth" 1.4 Bish This means that if K/D were the all important stat you make it out to be rook "skill" would acheive parity with bish "numbers" at 140 bish to 100 rooks. Making the numbers say 200 bish to 100 rooks only means that the rooks are at a "slight disadvantage due to their mad sk1llz" because in an even world this would only mean that rooks are only 40 pilots down to the "skill" difference. A 40 person difference in the MA now I don't think anyone will argue is that significant from a numbers perspective but a 100 person difference definately sets off buzzers. So if Rook skill is what you make it out to be and could indeed operate at only a slight disadvantage due to the skill differences between Bish and Rook when outnumberd 2 to 1, where exactly did the Rook complaining about being outnumbered come from since their skill is enough to offest the numerical difference? Why does this even still come up? Think K/D stats still show everything and that, to use your own words "have a ZERO NET effect"?
2) The core fallacy to your argument is that it is numbers that most directly effect perception in the MA. If numbers are even then it does begin to come down to skill. However if one side consistently has a higher number of players they are able to either have large attacks against a given target or pursue meaningful attacks against multiple attacks. Either way it is through saturation alone that the defenses of the country are attacked are overwhelmed. Skill really doesn't enter into the equation at all. For example, do you think that someone with a K/D ration of 6 to 1 would have much chance to maintain this ratio if he were always in fights solo where he was outnumbered 6 to 1? In your scenario killing all 6 opponents should only be an "average" accomplishment and should be readily repeatable. Think this really is the case?
What this leads to is that the side with the most numbers is able to take bases more consistently, regardless of skill and simply through saturation. In other words, when one side is able to roll over the others with impunity because of numbers and the other two countries are constantly fighting against terrific odds (even if their K/D ratios say it should be no problem) that people will begin to call foul.
It is only if the numbers are even or close to even that skill begins to enter the equation.