User blog comment:Goregutz619/HXH episode 121 discussion/@comment-14902757-20140319054543/@comment-48285-20140319173126

I believe that discussion was with me. And I still say that Killua left before Meleoron had called him. The flashback also sort of proves it. Meleoron was using God's Accomplice when he saw Gon and Killua in the room and Pitou was looking right in their direction. When Meleoron ahd touched Killua's shoulder, he was visible. So, I doubt that Meleoron would undo his God's Accomplice and risk being seen by Pitou.

As for if Knuckle had a chance against Youpi without Nen, I don't know. Knuckle is more of an experienced fighter than Gon and Killua are (/were at the time of fighting Rammot) so, I think he could have taken care of Rammot without Nen without much trouble. If Youpi had gone bankrupt before his head cleared, then Knuckle still might have had a chance of fighting him.