Undoubtedly. A few points. They're relatively the same size. Thus, size wize, Yamato could fit into the part of Tobi. If you notice, Yamato's right eye seems to spiral in the exact same direction as Tobi's mask--also, only Tobi's right eye is "revealed". The hair is also a dead give away: it is exactly the same in appearance. EDIT: Bwaha, I meant right not left.