Kishimoto just forgot that villains need chakra too.
He seriously has bijuu level reserves if he can control all the paths, somewhat contorl the bijuu, fight two perfect jin's, Kakashi, Gai and now the alliance. And the worst thing we've seen is him sweating, or thinking he was. .
I'm calling Bullshit on this... I don't see anyone, not Kisame, Naruto, Nagato, Madara, ANYONE. . . Having that much chakra to do this and still spam a MS technique. And now he's going to 1vs1 Kakashi. . .
Yep, I'm just thinking Kishi didn't even take into consideration that Obito needs chakra to do this shit.