I think some people give too much importance to supernovas when they were not even originally intended by Oda. It was his editor who suggested that he create them in Shabondy. That's why they don't have so many exploits that Luffy the author doesn't focus much on them.
After, of course, some are more important than others, in particular Law for his history with Corazon, his devil fruit and the fact that he is part of the D Xdrake for his history with the navy, his link with Doflamingo etc ...
Bonney the same for her past with the government, her link with Kuma, Blackbeard It's so that when I see people expecting a lot from Kid, I ask myself questions, which is not expected by Oda at the base, don't ask him too much