Re: *SPOILER* Couple of reasons/believable guesses why Tobi is the Elder Son of SOT6P
My guess for your question, he gave his eyes to nagato. Then told itachi or someone to take the eyes of the dead uchia's. Then next he transplant 2 to him. Thats how.I don't think so. Tobi's s/t jutsu is a swirl, not a spiral like the Elder son's eyes. He also seemed to not be phased by the obvious similarity Naruto had to the So6P, nor did he know what he talked about when Naruto mentioned the Biju's names. Also why would he have sharingan when he's supposed to have different eyes?