Why do you think the Yurchenko was admitted as a "safe enough" move when they had to change the vault table to achieve the safety of it? Meaning, do you think the influx of Eastern Bloc coaches who lacked the university training in things like safety and sports ethics or whatnot was responsible for this move being competed by girls before the vault change?
Ahhh... you might want to check your facts/assumptions regarding coach education throughout the world...