Only war has some average IG guys - not the chosen of the inquisition !
Exactly, random IG nobody is not the person an Inquisitor will be collecting as an acolyte. The one who's a cut above the rest, who shows promise, that's the one they'll be recruiting.
Why exactly should this snowflakeness be expressed through Characteristics? Isn't it enough they have specialised skills and talents, and access to some wicked, wicked toys?
This system has never been D&D, and it really doesn't lend itself well to a wide range of Characteristics or anything much in the way of Characteristics growth.
And as others have pointed out: Fate.