For a while now I've been trying to figure out how gantz works and i just wanted to share my thoughts
Gantz can't just pick up anyone they have to be dead first or somehow tagged aka things in people heads/capture gun or of course they have to die this is the part where i'm confused cause whats the differenct between teleporting a living body to a recently dead body it seem more like Gantz isn't allowed to grab people unless they just died.
The reason I say isn't allowed is because obviously dosn't have an qualms about killing people to get them on his team -note the massacare by Izumi to get strong people-. So after that screening issue, Gantz picks the strongest people out of the recent deaths and adds them to his team.
Also to all you people speculating about Gantz based on what Nishi has said you need to realize that he is a LIAR and you can trust nothing that he says