Anyways, evidence... first thing off, yes, I know how Akatsuki leader looks nothing like Yondaime, with the red hair, eyes, piercings, and tatoo's. And besides, why would Yondaime go evil anyways?
Ok, well, about the red hair, who else has red hair (or shall i say fur?) that Yondaime has had contact with during his life? Kyuubi! Maybe during the sealing, part of Kyuubi had gone into him instead of Naruto, thus creating the red hair, like when Naruto went four-tails, instead of a red-chakra fox-shaped aura around him, he grew red fur all over.
The eyes... some important character has some wierd looking eye. Byakugan, Sharingan, Mangekyou, Kakashi's Mangekyou, and even Naruto's eyes changed whenever he goes OTK or more. So again with Kyuubi, maybe Yondaime's eye changed permanently.
The piercings and tattoo's... anyone can get those, so that doesn't really matter to me.
But Yondaime gone evil? Again with Kyuubi here. When Naruto uses Kyuubi chakra, he usually has barely any control over it. Likewise with Yondaime, maybe he has no control over himself too.
Well, yeah, so those are just my idea's, it might be possible. Highly unlikely though. :tongue: So again, please no flames...