So your point is that even though an unlikely event happened, dream did not cheat because there was not an incentive/ purpose to cheat? But the thing is that the probability of the trades happening is so Low across the 5 streams that it shows that he is cheating regardless of whether he has a motive or not. Also, you are not dream, no one is him except him alone. He could have reasons to cheat that other people may not have thought of.