Waiting for the coming chapter, a theory came to mind. Since in AgK nobody is safe, I believe we will soon see Tatsumi die, with Wave taking his place within Night Raid. The two characters have been well developed, and there is still much to know about Wave. Since the main character is Akame, not Tatsumi, I think he already served his purpose, and that it was on purpose that Wave is very similar to him.
What say you?