User blog comment:Bennlimos/HxH Questions & Thoughts Discussion 9/@comment-4783583-20141024212043/@comment-14902757-20150404104118

4) it'd be cool to actually see a separate dimension where he imprisons them.

5) oohhh, that makes a lot of sense... that actually answers the question by 50%. As for replacements like Shizuku (replacing presumably #8 who Silva killed) and Kalluto, I'm still not sure. Obviously they trusted Kalluto as a replacement not knowing that Kalluto probably would never be as loyal to the group because he has a different objective in the first place for joining the Troupe.