there's something about a leader being killed by his own subordinate...... a truly humiliating death. it just goes to show that he's not worthy to be king in the end. he became too blind for power.
I feel bad for him, because even though he was greedy for more power, he wanted to pass down the power of the castle to his children. That's..hm. It humanizes him.
I agree with Soo-Won, I do think Kyo-Ga really is the better choice to rule the tribe right now. I also expect Tae-Jun to support him well in his task.