Super leopards just need 2x leopard, the pied is just an extra. There has supposedly already been two super leos produced that are not homozygous pieds (im not sure if they are heterozygous) and im also unsure how closely related they are. Also I think it's too soon to really put a number on how often it happens, they used to say 99% about the banana/cg also and now they say its more around 90%. With the linkage alluding us for all these years, you would expect it to be a high number though.