I'm not sure if this has been discussed before, and I didn't see anything like this when i looked at the other posts, but here it goes.
Do you think there's a reason Gantz chooses the people he does to go into the room? Or is it just a random selection of people that he selects until there is an effective team of players? Is he just sadistic and chooses people unlikely to survive, but when things get more dire he chooses a really strong team, like the current one? I find this an interesting topic that I myself can't find an answer to. I look forward to discussing this matter.