This chapter is somewhat infamous for its bad art, actually. Usually Togashi cleans up these kinds of chapters in the volume releases, but he didn't do so for this chapter in particular.
The Chimera Ant arc was a very painful time for Togashi. It took him 8 years to complete and was fraught...
Camilla is an interesting pick but a plan involving her ability doesn't seem foolproof enough for Chrollo to go through all this effort. With the chaos of the succession war Camilla might just die before Chrollo can use her ability on Hisoka.