This hasn't been mentioned but kriss said the roshar foot is larger than cosmere standard lets say by 2 inches we also know that the average alethi is over 6 feet that means in real number they are seven and a half feet(horneaters being 8) which is larger than the average koloss (5-7 feet) even accounting for greater strength and the large ones i would say on a large scale 2 alethi can beat 3 koloss (being armored, use tactics, stragety, have steel weapons) I also think the alethi numbers are under estimated look at how big amrams army was and he was one of many brightlords under sadeas with their being 10 highprinces the alethi army would have to be at least 200,000 which would crush the koloss even if they are 100,000 now jah keved is another 200,000 with the rest of the world being another 800,000 is about a million soldiers to crush the 500,000 skaa peasants