Pitou is with no doubt stronger then any Phantom troupe member expect possibly Chrollo(and that only because of his hax) and far faster, yet she was looking like a child who was stand against Adult Gon who wasn´t even trying much yet low diffed her easily. She twice try to hit Gon, the firsttime she didn´t even had enough reaction to notice that Gon was already speedblitz her and leave the room. Only after some seconds she understand that Gon was in another room. Second time she try again a blitz attack but Gon easily dodge and kick her into the sky where she couldn´t even more anymore(almost knocked out by a simple kick of Gon).
So a simple kick/punch of Gon should kill of any Phantom member if we count the fact that even Pitou almost get knocked out by a simple attack and she is above the member of the Phantom Troupe.
Probably only Chrollo and Hisoka could became a problem but be honest, they get speedblitzed by Gon aswell, they don´t gonna tank a Janken punch. It was clear that Adult Gon and Pre Rose Meruem was standing above all other characters which we see in the past and that by a big gap. A Janken had a similar power in the end(the nuke) like a Rose bombe, that shit was insane.
Phantom Troupes lines up for their ass beating. No way, they could take him out considering that Pitou appeared slow motion to him even when he was enhanced, No way Feitan is tanking any of his attacks to be able to return any damage. They all get decapitated by a single large janken scissor.
Adult Gon solos negative diff. He is relative to Pre-Rose Meruem, if not at the same level. During the Meruem vs Netero fight, Meruem was able to casually tear the limbs off of Netero, a superior enhancer to Uvogin (In every stat), while holding back and trying not to kill him, as he wanted to learn his name. If he wanted to, he could have very well one-shot Netero. Just based off of this, there isn't a single phantom troupe member who can survive a single hit from him. This is even more solidified by the fact that Netero is an enhancer and as you know, defense is an enhancer's specialty. So the fact that the best enhancer in the troupe is trumped by Netero in durability, who Meruem can one-shot is more than enough evidence to suffice. There's also the fact that no one in the phantom troupe can damage him, as some phantom troupe members had trouble with mere squadron leaders and officer level ants. Adult Gon being an enhancer as well, makes this even worse for the troupe because a charged Jajanken would inherently be dozens of times more powerful than a normal attack from Meruem, who is a specialist. Adult Gon can literally AOE the battlefield to kill the troupe, ignoring the fact that he is wayyy too fast. This is spite.