<He's actually very smart.
Well, we don't mean idiot in the sense of having a low IQ. Perhaps "pig-headed" better describes what we're trying to convey. (Personally, I particularly like "uninformed diktat".)
<Is quick with his logic and common sense.
Well, demanding that your reports eschew best practices in the name of less-maintainable code doesn't seem to show a whit of common sense, although it probably does indeed require a gifted logician to successfully argue the point of view.