A friend asked; what do I do with staffs that are just too dumb to be any good. To be honest, all the training in the world is not going to change him/her because "dumbness" is an attitude; not a skill deficiency.
It's like a sense of initiative or curiosity, it is not a condition or an affliction, but a state of mind. So a Dark Manager will take one of the following options
a) Assign him to the most mind numbing task possible, as typically folks at the shallow end of the IQ spectrum have a high threshold for boredom.
b) Give him a glorious commendation to be transferred to another department.
Either way, out of sight, out of mind.
Seriously though, dark managers love dumb resources because it's the few people in the world that can withstand the dark manager's ingenuity (note: sarcasm).