u've mistake tat to legend of korra.

Nah, iiiiiiii think he's onto something...

How was he gonna contact oro?

I'm guessing reanimation jutsu or something. If it can be used to turn the tides of the war, that's plausible.

so... Orochimaru just became one of the candidate behind Tobi's mask...

That's impossible..

Anything can happen in this manga, I'm not saying 100% Oro, just one of the candidate. The man who knows everything...

Yeah but Orochimaru was still alive when we saw tobi the first time... And technique are way too different to be Orochi

You are right. Then again, to be in 2 places at the same time isn't really that hard for someone like Orochimaru.
I'm not saying he's one of the top candidate, just one of the many.

Not a candidate at all imo. Orochimaru is his own entity. He doesn't want the Moon's Eye plan.