Question about black legs in Silkie Mix chicks

[Katznchicks]

Last year I hatched a chick from a Splash Bantam Wyandotte rooster and a White Silkie hen, this chick grew into a rooster with white legs.

This year I hatched some of his chicks from Blue Silkie hens, some of the chicks have black legs and some have orange.

I am wondering if the leg color is any indication of gender or just random.

Thanks for any help.