The stats are not fixed to a certain amount of re-rolls (5,000), each stat has a different percentage to get, it absolutely depends on your luck. Logically, more re-rolls means a higher chance to get the stats you want.
I asked Agatio if there's an other additional x percentage, unique to each rank 8 item (eg two different wrists with two different additional x% of getting a certain stat), and he said no, that additional percentage doesn't exist, each item has equal chances to get a certain stat, it just depends on your luck. Some people got triple int with 14-15 re-rolls, meanwhile I'm reshaping my wrists since 2014