I'll make him forget. Not just his connection to us or the Boss, but everything leading up to the point when I erase everything.

When I'm done, he won't even remember his name. [Hard to be a problem to them and Chrollo if he can't even recall the slightest detail about his life or who he is.] But he'd probably need to be held down, so I guess you two could still get physical if you'd like.

Of course, this is if he stops being useful and starts to get out of hand. I'd rather get the information I need and show Boss exactly what he was up to with the Chain-User. Then we can all decide what to do with him.