Have been chatting with Mr. Warhammer40D6 about GNS theory.
Consider the following situation --
There are three adult ogres and one juvenile that fights half as well as the others.
Which would be your preferred reason for this to be so?
1) The juve is there because I didn't have enough XP budget left over for a fourth adult.
2) The juve is there because he is meant to pose a moral choice, whether to allow a youth to live to adulthood, knowing he will likely be a threat.
3) The juve is there because I determined that 24% of the ogre population are non-combatants, and they were randomly placed with other encounter zones and as wandering monsters (fulfilling various menial tasks).