Roger:
Unfortunately, you're basing your side on a technicality -- splitting the two words up, taking their individual meanings separately, and then hiding behind the false-innocence facade of "but this is what Webster says!"
Roger, I'll be 46 years old this coming March. Yes, comparatively speaking, I'm a "youngin'." But I'm old enough to remember the old days when "idiot savant" was not a disrespectful term at all. The old days definition was to describe a person with below-average overall intelligence (perhaps even a mental disability) that had one single unusually gifted talent -- playing the piano, calculating/reciting pi to a thousand places, etc. In the old days, this term was [perhaps unfortunately] used colloquially, and applied to normal people with unusually high talent in a certain area. Hal Houle is from those days, and I'm sure -- no, I'm certain -- that he meant this term in the "colloquial" fashion.
These days, "idiot savant" is considered politically incorrect. Today's correct term is "autistic savant" to describe the dictionary-correct aspect of a mentally-challenged person with a single unusually gifted talent. And today, no matter how you slice it, applying "idiot" in any descriptive adjective is considered disrespectful. But remember, Hal is from the old days. Perhaps you adapted to today's political-correctness quicker than Hal, but for you to hold a technicality against him (especially under the guise of "Webster's definition") is, IMHO, bad form.
No disrespect intended, but I had to share my input on this.
-Sean