OP its odds, math odds. The odds are you will get a weapon after a primal 100% of the time, the odds of that weapon being what you want is 1/9. This only means that every time you kill garuda you have that 1/9 odd. So if you kill her 9 times, 90, 900, the odd will never change. This is why it's quite possible to both see the same thing drop 4 times in a row, yet to never see another item. This being odds, it is possible, even if very unlikely that, that 1/9 odd will make it so you never sill a given item. Yet you see another consistently. i have done ifrit 102 times of of today, i am yet too see all the weapons. They are odds, not percentiles.