Would certainly be quite confusing once I update him beyond the Future Arc. sldj

But as of right now, directly after they win the battle for the Vongola Rings with the Varia. Mostly 'cause reading through the manga has been a bit slow since I have another character who's been busy in his game lately. '^' But after stuff with him settles down, I'll likely canon update Yamamoto to after that Future Arc - probably to the point with the Vindice, really.