Well, this explains how Gantz was able to revive people. Or er, at least showed us that they have the technology to basically retain a complete clone of someone with their memory attached.
The startling matter that it maintains the personality/soul/memory of the person is pretty damn cool. And of course, they just had to kill all of them to show a point. Really liked these 2-3 chapters.
Perhaps the revelation is basic. But what more can you expect? Anything other than basic will be criticized for being convoluted or nonsensical. After all of this, I feel the explanation was just right. It wasn't convoluted, but in this world, it is their "truths".