When I was a JW, I never thought it was one big stone followed by other small stones. I always thought the people who did the stoning got to pick their own stone, some could pick real big rocks other could throw a grain of sand, or other could chose not to throw anything at all, as long as they were not a witness,.. because witnesses were to throw the first stone(s).
If someone lived a trillion X longer than you, and had a billion X more reasoning ability would he come to the same conclusions as you?