That's not Tobi's main plan, if we take in account his moon's eye plan, makes sense to be Obito. He "died" in the war, if he survived he would want world peace, and that's what Tobi really wants, world peace. Tobi is not a "bad guy" he doesn't kill people, he only kills only when there's not other option, if he was a bad guy he would have killed Naruto already in the past, during the Kage summit, or when he first encountered him.
The attack to Konoha could be he testing his powers that maybe Madara gave to him.
Would make sense, Obito almost dead, Madara finds him, sees he is an Uchiha, reconstructs half of his body with a Zetsu, brain washes him knowing he is against wars, and ta dahh there you have Tobi.
I'm not saying Tobi is undoubtly Obito, I'm just saying it's not a so farfetched theory has you said, at this point is as credible as any other.