Nerdo gets the points. A kill is a kill. If anything, gantz loves sick irony and probably loved having someone use the boss's own head to kill tons of underlings.
Thing is, I can imagine Nerdo coming just short of 100 points and ended up dead in the next mission which would be a riot. What I see more likely to happen is this: Anzu being revived behind our backs in the future and just showing up at Katou's place someday without warning.
I still sometimes get the feeling that Kuwabara is the father of Anzu's kid, and that he survives and has some sort of input on all of that... Not that he likely cares that much. I thought this theory was a bit of a stretch when I first thought of it, but posters on the Japanese forums also came up with the same possibility. Would be interesting. Maybe