Peter

Everyone related to Gojo is long dead.

According to him, he's the last of his clan meaning Six eyes won't be passed on IF Six eyes is a trait that only runs in Gojo's bloodline.

That's why he ranks second.

Ayanokoji Kiyotaka has a genetic anomaly making him sorta superhuman whilst Light was your average highschool dude with just incredible intelligence.

So it's undebatable