Are you kidding me?
You seriously underestimate Hisoka, he can beat Netero just like Meruem did i.e without even breaking a sweat. Have we seen Hisoka going all out, trying to give in his best, he toys with everyone and doesn't even try to kill the weak ones.
Togashi haven't shown us yet how strong Hisoka is, what is his limit, we just know he is really over powered and anyone who dares stand against him is obliterated.
Meruem is the only guy who can stand infront of Hisoka and yet give him tough time, I do not underestimate meruem in any way but we know that Meruem has a limit and we are well aware of that.
But Hisoka defeated all his oppoent with what? Bungee Gum, are you kidding me? Such lame stuff, that's all?
No there is a lot more, His Nen is nearly equal to that of Meruem.
that's why he'll be the final villain to be faced by gon and imo that's the reason he wasn't shown in Chimera Ant arc because he might have the fight he longed for and Togashi had to show away all Hisoka's "Cards'.
Ce message n'est pas ironique . 
y'en a sur Kuroro aussi c'est sur , mais Hisoka c'est a un lvl de dingue . 