I see your point but I mean he has lower reasoning skills than most but some managers I have seen at my company cannot figure out how to set up simple "some assembly required" displays and while this fellow has some problems trying to assemble the displays he can at least point out this goes here that goes there while my bosses cant even figure out how to get it out of the package.....
Different people have/lack different skills. Apparently, your coworker has good visual perception, while other skills are impaired. Your manager, on the other hand, probably has better verbal skills and poor visual perception. No one skill, or lack thereof, determines a person's intellectual functioning level. It's how the whole thing comes together and what kind of overall functioning the person comes out with.
To give a better example, I've seen kids who can read quite well. However, they don't understand a word of it. Reading without comprehension is just "word calling", and not very functional.
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