They just left everything unfinished. I don't understand the logic either; a guy, a rich one but still, comes into camp and just bosses everyone around. To his help he has exactly 1 man. He was big, but one man nonetheless. With the way the show had been up til then, I have no idea why they didn't just kill the fucker right then and there. Problem solved - everyone happy. Even at the end, they had 150 Chinese blokes with guns...
Ah, well. They obviously didn't plan to end the show after season 3, but as a season it still lacked a real ending, a finale.