He does seem to share their qualities being a sociopathetic terrorist murder but also good comradeship with Sub and Bara sharing risks equally and giving into the protagonists on the condition bara is healed . Assuming the 3 are quite attached would you expect all 3 to be in the troupe but only replace one member ? He is very skilled in nen although I wonder if that was a tie into Gon and Killua learning nen He is a conjurer but little flower is transmutation , and his bomb hatsu apparently requires skill in manipulation and emission . His technique also works like the MC elder and could be good in kidnapping hostages and getting money as well as exploding open sealed areascontainers . As Gon has already figured out his weaknesses , all of which require him showcasing what he learnt from Bisky ' s training I do wonder if his use in the story is complete and he ' s now in Prison .