I've been waiting forever for this day to happen!! There is seriously no way that Fencing Man isn't Kookie. Any army can tell just from the first word that he sang that it's Kookie.
Here are some other videos that I found. I guarantee you that he was doing that meme face behind the mask lol. Btw, this is from episode 71 in case anyone wants to watch it when it's subbed or if you want to watch it raw or whatever.