They're not copies, he was sent back in time, that timeline doesn't exist.I'm glad he didn't decide to kill the slave. He's gone through a lot and he might make an excellent warrior. Everyone else can die. The people on that world are soulless. There are copies of that same world so you should see it as a save file like when you play skyrim or something.
If it moves its expEvery normal mc: my exp point are from monster that coming to me from nowhere that you wouldn't expected.
GOD GRID: my exp are from bonus events and buff, and ofc from my enemies of my comrades and friends.
This mc: my exp are from my comrades.