Supernova are literally Characters that Oda added at the last minute & he himself said that he was gonna make most of them drop from New World and expected only Kid to be relevant among them
But people think that Oda was like: "I will make most these extra characters stronger than my second main character who is destined to become World's Greatest Swordsman & trained under Mihawk for 2 years"
Luffy & Zoro >> Supernova
I don't care what you think about Zoro vs Killer & Apoo but it doesn't change the fact that Oda decided to make a Member of Worst Generation get introduced & defeated in the same Chapter at the cost of drawing a cool scene of Zoro's Oni Giri & also made another Supernova get one-shoted so quickly & drop out of the game just to show an angry Zoro
This clearly shows that for hyping Luffy or Zoro, Oda doesn't care about any other Supernova
However they do shine against other Characters, just not Luffy & Zoro
Main Character Supernova >>> Non-Main Character Half Way Introduced Supernova