@uniaka:
I want to see if Law ever uses ''Gamma knife'' ever again, it's kinda like zoro's asura. DD was one of the very few that can counter it, use it on someone like jack, and he should be dead.
You know what else he hasn't used again at all? That Personality Transplant Surgery. I hope that actually comes up again, because otherwise it will have been a one-time thing that was used in Punk Hazard, makes the least sense of any of his techniques we've seen so far, and was ultimately just used for a many-chapters-long gag. That seems dumb. That's actually kind of like Zoro's Asura, too: uses it twice, doesn't really make sense, and never mentioned again post-timeskip.