It's obvious that Kurono Will NOT be free. Gantz is going to say "oh hell no! you're my bitch now, and you do as i say."
btw most people think of Gantz as having a sick sense of humor but i found Gantz to be very caring, beneath all that tough-love exterior. I think deep down inside Gantz really care about Kurono. For example during the mission when kurono do not have his suit, Gantz Made kurono get some points, because Gantz wants Kurono to be better, it seemed that everything Gantz do nowaday revolves arround kurono. Since Tae was getting too close to the truth about kurono, Gantz decided to have her killed, but after that, seeing that Kurono was so devestated by her death, Gantz added a third choice to the menu, so kurono will work harder to revive Tae. My theory is that Gantz realized the important of Kurono, and believe that Kei is one of the strongest Gantzer in history. Sure it wasn't always so, but as you can see Gants is slowly building up kurono skill as time progresses, remember the time when tae was slashed by izumi, i'm sure tae was not dead by then, and yet she was transfered imediately, i think Gantz did this to save kurono, because if you looked back at it, Izumi was rasing his sword for a final blow, and if he cut off tae head, kurono head would also roll, so Gantz decided to teleport tae away, saving kurono in the process. Hey, i could be wrong, but it really feels like, this whole Gantz ordeal was to make Kurono into a better man.