I’m not sure I follow that, how is it distracting/unfitting? I don’t think I’ve ever read anything about rebels having hair colours dependent on rank (if that’s what you mean, but I may be being naive).
Maybe its just personal preference but i think the purple hair looks a little goofy and maybe a bit childish for an admiral of the rebellion, I mean could you imagine how silly it would look on someone like Tarkin or Hux?