post the panel where it says Killer is weakest Supernova.
Luffy is Luffy
Kid is his captain
Law was a warlord and defeated Vergo and Trebol
Capone was able to tank some punches from BM
Urouge defeated a YC4
Drake is a Sword Captain, defeated a Number with one blow and was slowly dominating against Apoo
This leaves out Apoo, Hawkins and Killer, casually the ones who fought with Zoro.
But you are right, It would be weird if these two supernova captains became weaker than Killer during the TS but it's still a possibility. And Bonney might be weaker too.
Let's say Killer is in the Top 3 of the weakest male supernova. On the other hand Kamazo, nerfed Killer, is certainly below them. It would be absurd if he was stronger than them without his weapons, his CoA and part of his mind.
Urouge wasn't using his DF against Killer before someone tries to use that clash as a feat to push Killer near Snack
(he fainted from being hungry).
Right after a scythe passed through his chest, sure
Hunger or food poisoning might have concurred, but they were not the reason because he fainted
Apoo knocked out Luffy and he needed help to g4 to getvout of ulti grib. See i can say things without context too
A pity Apoo hasn't even used his DF against Zoro