I can't see him being in tobi's dimension, because tobi would obviously know, He'dve said something when Madara inquired into his whereabouts. And honestly if he is in the diension, obito has won, just leave him there for like a weak and a half and comeback to an emaciated, starved, delirious Naruto. Him being at the island is actually very plausible if only clones are with kakashi and company.
Sorry guy Tobi can not make the difference between a shadow clone and the real Naruto unlike Madara.
I'm having difficulty trying to pick up what you're implying. What I'm saying is if there was something in tobi's dimension, he would know. Naruto actually being in the dimension would mean obito has won as far as capturing the kyuubi.
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I think this happened in Obito´s dimension. Kakashi had send him there using Kamui and Obito looks pretty surprised seeing him there, so basically he didn´t know.
The thing about touching Naruto is using the Rinnegan path to take his soul i think, not to get him in the alternate dimension.
Ok, and if he's in there, who will let him out? How will he eat? Obito can simply let time fight his battle, no matter how strong naruto is, he still possesses biological functions, about two and a half weeks in Obito's dimension is enough to definitely finish off Naruto. If he is in their then he is trapped