even after all we have seen, there just still isn't enough info on hisoka. we know his abilities, at least some, but he never seems to go all out. We never seen him genuinely want to kill someone and fight them. There are strong people he wants to fight, they all seem like they would be stronger but idk. i dont think he would be so eager to fight someone that could straight up demolish him. He seems extremely confident in his strength, considering he casually thinks about whether or not he should kill killua or illumi like its nothing so that he could get the other to be pissed off and get stronger to fight him. Illumi seems very powerful and to just be able to kill him on a whim like that makes me think hisoka is stronger than we realize. probably stronger than netero and maybe on par with the ant king or stronger. i wonder how it would have went if other strong people were there to fight the ant king and why they werent there at all? 12 zodiacs? Hisoka? Illumi? They could have just roflstompped the king cuz he would become a srs threat if he were to live.