This is just mere theoretical speculation more than anything. I know for a fact that all the hokages know Tajou Kage Bunshin, so here's my question. If the 3rd hokage used kage bunshin (which were two used for the previous Hokages) to seal the 1st & 2nd Hokage and Orochimaru's arms with Shiki Fuujin; then isn't it possible that 4th Hokage didn't die just by using one kage bunshin with a shiki fuujin to seal the Kyuubi into Naruto? I was just curious, by looking at the outline of the Akatsuki leader's head and the eyes resemble that of the 4th Hokage. I don't know.