They all did I think but were all transfered. Afterwards the team went back to gantz they got the bombs taken out but Cherry and Kei1 were not there so they still have theirs implanted in their head.

Next chapter is going to show us how awesome the main character is and will do the epic solo kills like he did in bird boss, budda giants, dino fight and oni aliens. Kei being motivated was when he would beat top aliens and it sounds like he says he is pretty motivated now. But whatever happens this will make the plot advance alot (Unless he just takes the alien out and that alien is just overrated and doesn't speak) I have a feeling it will talk at some stage and tell him why they are here and the plans for earth.