^ Relatively fewer games i.e. 125 vs. 155 OR 283/301 vs.419
First of all after playing 125 games, its very hard for your average to drop anyway (unless you keep on taking golden duck for 10/15 games) so theory of "maintain in a long term" does not live.
For argument sake if we assume that this theory is right then even by your own logic, Kallis and Ponting made "relatively" fewer runs by playing "relatively" fewer game.