You have good eyes. I know who Furuta is but I didn't recognize him when he was with Kaneki. He doesn't have any special trait like many other characters so it's easy to forget his face.
By the way, on chapter 117, Touka appently mistook this guy for Kaneki at one moment (when she saw his back). Maybe Ishida planned this from that moment? I call this a good foreshadowing.