"the average person is Below average in common sense"

Then they aren't average in the first place. If below average common sense is actually average.... then that's the actual average and the person is not below average in the first place. No offense but this sentence itself is below average in common sense.

"the average person is Below average in common sense"

Then they aren't average in the first place. If below average common sense is actually average.... then that's the actual average and the person is not below average in the first place.