How does the leveling system work in the game, i heard in co op your friends can join in any mission and its open world so theres no "zone" they cant enter because you play more then them and they will get smashed like a bug. Also what if you already did a mission in sp while they were unable to play can you redo it with them and still gain xp? Last once you clear a canp or what not do enemys respawn or disappear for ever like in farcry, aka will i eventually be left with a empty map with nothing to do. Thanks