Jay had striations in is quad sweep. Haney, Yates, Schwarzenegger, ect didn’t have that feature
Munzer had it too, so did Shawn Ray
This is pure genetics.
Munzer had them all over !!
Platz had them .
When I was in peak condition many many moons ago
I had striated thighs , pecs , triceps.
Ahh I miss them competion days.