i think you sum up the entirety of the error in your logic with these two statements:
"You guys have given reasons attempting to justify said 43 point swing, I've conceded those as making some difference, however I still don't think it would make up 20 buckets, thus still making the situation unjustifiable in my eyes." - nobody is saying anything like a 43 point swing would be the average case if you simmed that pair a couple thousand times. but it would definitely happen a number of times.
"Like I said, if this kind of thing happens ONCE, its a problem." - i would go as far as to call that delusional. if something has a 1 in 1,000 or 1 in ten thousand chance, and you sim thousands a day, it is inevitably going to come up eventually. claiming the opposite is denying reality.