The young Dai'rou's mask represents the rigidity and strict adherence to hidebound rules that he has always felt he had to maintain. While Ketu'a is not going to throw the baby out with the bathwater and reject his position or Tanjia's basic legal system, he's prepared to be much less by-the-book and bend a few rules. (#Tanjia belongs to @Sorachan)
Ketu'a is magnificent!! Such rich, bold colors and they look magnificent on him! The few brilliant gems add just the right touch to his robes. And what a great mask! The metal is a fantastic choice, especially considering what he chose the mask to symbolize. Ketu'a is a skilled and compassionate leader, I have every confidence in him. Especially if he receives some aid from a certain Empress-to-be. ;)