How would you rank the Supernova by powerscaling? Do not include Luffy and Zoro, please.
Since Kidd never showed anything impressive aside from that giant arm made of weapons of his, which we don't even know how powerful it is, I can't say he's the strongest of them.
I'd say that X Drake is the strongest of them. He was a Rear Admiral before becoming a pirate, and we know that RA is one rank below Vice Admirals, which is very impressive. Second, he is pretty strong.
Capone and Bonney has very cool abilities. Bonney can probably shoot beams like Hancock's and Foxy's, since she was sitting on a building when she affected the marines with her ability. As for Capone, I'd say that his ability works vice versa as well - I mean, that if things that come out out of his body restore its original size, so things that come at him, will become smaller. Things like punches, or weapons, so it's pretty much a good defence.
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