User blog comment:B214/side series/@comment-5916303-20150204121324/@comment-12511635-20150215171143

If Tatsumi had not killed Aria someone else in Night Raid would have. He was traumatized by Sayo and Ieyasu's deaths but he seems to realize they would not want him to succumb to despair taking action to ensure the Empire's atrocities do not occur again would be a better course of action.

Wave's character development would still be redundant becuase in the end Honest is still in charge of the government and the corruption will still continue unabated something Budo himself noted. Esdeath herself is apathetic to his policies since their professional agreement ensures she can satisfy her desire for combat by killing his enemies created through his corruption. Esdeath is also Wave's commanding officer if she ordered him to assist in aiding Honest or telling him not to concern himself about the offenses he witnesses  he would have no choice in matter. Wave even states in the series he can only fufill his duty as a soldier and one of those responsiblities is following orders without question from his superiors in the military and government. Run was more interesting because despite his choice to pursue internal reform he did deride the revolution as evil he admits he probably could have joined at one point. Getting killed by Kurome is a symbolic illustration the Empire has to be destoryed or it will continue to be mired in its corruption.