...i would laugh at you in the face if i ever saw you. lol Kishi himself told the audience he died. The old man ain't coming back. Besides, don't you think Pein would have cut his head as soon as he found the body under the sea, just to show proof. Oro is dead. Jairair is dead. Hell, i wouldn't be surprised if Danzo dies but hes too cunning for that.
And naruto has a very deep story. Side plots and main plots and sometimes they intertwine that goes so deep it's no wonder the fans always comes up with theories to sedate themselves to feel better about something.
Kakashi always says "Look underneath the underneath." Well, in my opinion, this whole story needs to be read between the lines.