Naruto did literally bring Obito back in chapter 682. The Sage can't talk to Obito because he is dead and was wondering if he was still there. He didn't know Obito died.
Ok that's a good point, he could be refering to 682, but the Sage just meant he would get the story from Obito's perspective. Sage can talk to anyone in the pure world, so I'm not sure what you mean about him not being able to talk to Obito because he's dead. It's living people he can't reach unless certain pre-requisites are met. What probably happened was he checked for Obito in the pure world and when he wasn't there he asked if he was still in the impure world (inside Kakashi).
Like I said if the sage didn't see the fight, he wouldn't have known Kakashi led them to victory. It's been established he can see the events in both Naruto and Sasuke's life. You're taking one comment and using it to trump a plethora of manga facts. There's no room for debate here.
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