Fair enough. I haven't seen all the anime filler episodes as far as their backstory goes, so working associates was about as much as I was assuming, since I don't really know much about her and Gai interacting based on what I have seen of their canon. No offense to Rin, but she was probably as much on Gai's radar as Obito was when they were kids...which is to say he said hi and then demanded a challenge from Kakashi. Silly Gai only had eyes for Rivalry.