After he came back to life, he showed Machi that he could pretty much heal himself with his nen.
Why didn't he do that while fighting Chrollo? Maybe he couldn't, and maybe it is true that after death his nen became even stronger, hence why he could give it a new use, that he couldn't do before (with a weaker nen).
If he had regenerated his leg and hand during the fight, then he could still have using bungee gum with those 2 extremities. So i'm pretty much confident that he couldn't do it back then. This is the confirmation that this Hisoka has a stronger nen.
Why didn't he do that while fighting Chrollo? Maybe he couldn't, and maybe it is true that after death his nen became even stronger, hence why he could give it a new use, that he couldn't do before (with a weaker nen).
If he had regenerated his leg and hand during the fight, then he could still have using bungee gum with those 2 extremities. So i'm pretty much confident that he couldn't do it back then. This is the confirmation that this Hisoka has a stronger nen.