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My guess is that his ability is not the usual magic as possibly he has destructive ability something like decomposition of material or magical construct and that this innate ability is so rare that it take out almost all of his magical circuit leaving only some for other weak magics. he can't construct a powerful magic but is able to negate all magics and possibly can even take lives and even deconstruct any material. Therefore, he hides his ability as it does not help him in any way unless he wants to take lives.
In short, i think he is like shirou in that he can't do most magics but he uses the magics that he have and brings it to the extreme ala UBW. A specialist of a certain magics.
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