You flip a coin four times. Three times it's heads.. does the probability that the fourth toss is heads decrease because if the previous three results? No. There remains a 0.5 probability for both heads and tails. Similar reasoning should be used for voidfang vestments if you are to assume RnG. That being said, it is highly unlikely that it is RnG... Imagine throwing 100 heads in a row - common sense would tell us that other factors have influenced the toss. Interesting thread.