OP has a point. I get that it's the team 7 reunion, so of course Kakashi will be there somewhere, but he's lost the thing that gave him most of his abilities. Can he even use any of the thousand techniques he copied over the years? Without it, he doesn't even have the reflexes to use his signature move properly. Even if he Could hit Madara with chidori, so what? Madara had half of his torso obliterated by Gai and healed up in seconds. I can see him giving out tactical advice since that's all he has going for him now (against an opponent like Madara, that is.) Yes, Kakashi is still an elite genius and more than a match for most other ninjas, but Madara spent his entire life crushing guys like him. Kakashi can't see the limbo-madaras, so how can he even formulate much of a plan to help out tactically? I guess we'll find out, but I wouldn't be too surprised if he ends up dying before it's over. Then we can look forward to thirty chapters of flashbacks while Naruto cries.